docs: Update README.md for home page (#11358)

Signed-off-by: Yuan Tang <[email protected]>

Makefile

@@ -632,7 +632,7 @@ docs/cli/argo.md: $(CLI_PKGS) go.sum server/static/files.go hack/cli/main.go
 .PHONY: docs-spellcheck
 docs-spellcheck: /usr/local/bin/mdspell
 	# check docs for spelling mistakes
-	mdspell --ignore-numbers --ignore-acronyms --en-us --no-suggestions --report $(shell find docs -name '*.md' -not -name upgrading.md -not -name fields.md -not -name upgrading.md -not -name swagger.md -not -name executor_swagger.md -not -path '*/cli/*')
+	mdspell --ignore-numbers --ignore-acronyms --en-us --no-suggestions --report $(shell find docs -name '*.md' -not -name upgrading.md -not -name README.md -not -name fields.md -not -name upgrading.md -not -name swagger.md -not -name executor_swagger.md -not -path '*/cli/*')
 
 /usr/local/bin/markdown-link-check:
 	npm i -g markdown-link-check # update this in Nix when upgrading it here

docs/README.md

@@ -1,5 +1,12 @@
 # Argo Workflows
 
+[![slack](https://img.shields.io/badge/slack-argoproj-brightgreen.svg?logo=slack)](https://argoproj.github.io/community/join-slack)
+[![CI](https://github.com/argoproj/argo-workflows/workflows/CI/badge.svg)](https://github.com/argoproj/argo-workflows/actions?query=event%3Apush+branch%3Amaster)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/3830/badge)](https://bestpractices.coreinfrastructure.org/projects/3830)
+[![Twitter Follow](https://img.shields.io/twitter/follow/argoproj?style=social)](https://twitter.com/argoproj)
+
+## What is Argo Workflows?
+
 Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Argo
 Workflows is implemented as a Kubernetes CRD (Custom Resource Definition).
 
@@ -8,10 +15,140 @@ Workflows is implemented as a Kubernetes CRD (Custom Resource Definition).
   graph (DAG).
 * Easily run compute intensive jobs for machine learning or data processing in a fraction of the time using Argo
   Workflows on Kubernetes.
-* Run CI/CD pipelines natively on Kubernetes without configuring complex software development products.
 
-[![Argo Workflows in 5 minutes](https://img.youtube.com/vi/TZgLkCFQ2tk/0.jpg)](https://www.youtube.com/watch?v=TZgLkCFQ2tk)
+Argo is a [Cloud Native Computing Foundation (CNCF)](https://cncf.io/) graduated project.
+
+## Use Cases
+
+* [Machine Learning pipelines](https://argoproj.github.io/argo-workflows/use-cases/machine-learning/)
+* [Data and batch processing](https://argoproj.github.io/argo-workflows/use-cases/data-processing/)
+* [Infrastructure automation](https://argoproj.github.io/argo-workflows/use-cases/infrastructure-automation/)
+* [CI/CD](https://argoproj.github.io/argo-workflows/use-cases/ci-cd/)
+* [Other use cases](https://argoproj.github.io/argo-workflows/use-cases/other/)
+
+## Why Argo Workflows?
+
+* Argo Workflows is the most popular workflow execution engine for Kubernetes.
+* Light-weight, scalable, and easier to use.
+* Designed from the ground up for containers without the overhead and limitations of legacy VM and server-based
+  environments.
+* Cloud agnostic and can run on any Kubernetes cluster.
+
+[Read what people said in our latest survey](https://blog.argoproj.io/argo-workflows-2021-survey-results-d6fa890030ee)
+
+## Try Argo Workflows
+
+[Access the demo environment](https://workflows.apps.argoproj.io/workflows/argo) (login using Github)
+
+![Screenshot](https://github.com/argoproj/argo-workflows/raw/master/docs/assets/screenshot.png)
+
+## Who uses Argo Workflows?
+
+[About 200+ organizations are officially using Argo Workflows](https://github.com/argoproj/argo-workflows/blob/master/USERS.md)
+
+## Ecosystem
+
+Just some of the projects that use or rely on Argo Workflows (complete list [here](https://github.com/akuity/awesome-argo#ecosystem-projects)):
+
+* [Argo Events](https://github.com/argoproj/argo-events)
+* [Couler](https://github.com/couler-proj/couler)
+* [Hera](https://github.com/argoproj-labs/hera-workflows)
+* [Katib](https://github.com/kubeflow/katib)
+* [Kedro](https://kedro.readthedocs.io/en/stable/)
+* [Kubeflow Pipelines](https://github.com/kubeflow/pipelines)
+* [Netflix Metaflow](https://metaflow.org)
+* [Onepanel](https://www.onepanel.ai/)
+* [Orchest](https://github.com/orchest/orchest/)
+* [Ploomber](https://github.com/ploomber/ploomber)
+* [Seldon](https://github.com/SeldonIO/seldon-core)
+* [SQLFlow](https://github.com/sql-machine-learning/sqlflow)
+
+## Client Libraries
+
+Check out our [Java, Golang and Python clients](https://github.com/argoproj/argo-workflows/blob/master/docs/client-libraries.md).
+
+## Quickstart
+
+* [Get started here](https://github.com/argoproj/argo-workflows/blob/master/docs/quick-start.md)
+* [Walk-through examples](https://argoproj.github.io/argo-workflows/walk-through/)
+
+## Documentation
+
+[View the docs](https://argoproj.github.io/argo-workflows/)
+
+## Features
+
+An incomplete list of features Argo Workflows provide:
+
+* UI to visualize and manage Workflows
+* Artifact support (S3, Artifactory, Alibaba Cloud OSS, Azure Blob Storage, HTTP, Git, GCS, raw)
+* Workflow templating to store commonly used Workflows in the cluster
+* Archiving Workflows after executing for later access
+* Scheduled workflows using cron
+* Server interface with REST API (HTTP and GRPC)
+* DAG or Steps based declaration of workflows
+* Step level input & outputs (artifacts/parameters)
+* Loops
+* Parameterization
+* Conditionals
+* Timeouts (step & workflow level)
+* Retry (step & workflow level)
+* Resubmit (memoized)
+* Suspend & Resume
+* Cancellation
+* K8s resource orchestration
+* Exit Hooks (notifications, cleanup)
+* Garbage collection of completed workflow
+* Scheduling (affinity/tolerations/node selectors)
+* Volumes (ephemeral/existing)
+* Parallelism limits
+* Daemoned steps
+* DinD (docker-in-docker)
+* Script steps
+* Event emission
+* Prometheus metrics
+* Multiple executors
+* Multiple pod and workflow garbage collection strategies
+* Automatically calculated resource usage per step
+* Java/Golang/Python SDKs
+* Pod Disruption Budget support
+* Single-sign on (OAuth2/OIDC)
+* Webhook triggering
+* CLI
+* Out-of-the box and custom Prometheus metrics
+* Windows container support
+* Embedded widgets
+* Multiplex log viewer
+
+## Community Meetings
+
+We host monthly community meetings where we and the community showcase demos and discuss the current and future state of
+the project. Feel free to join us! For Community Meeting information, minutes and recordings
+please [see here](https://bit.ly/argo-wf-cmty-mtng).
+
+Participation in the Argo Workflows project is governed by
+the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md)
+
+## Community Blogs and Presentations
+
+* [Awesome-Argo: A Curated List of Awesome Projects and Resources Related to Argo](https://github.com/terrytangyuan/awesome-argo)
+* [Automation of Everything - How To Combine Argo Events, Workflows & Pipelines, CD, and Rollouts](https://youtu.be/XNXJtxkUKeY)
+* [Argo Workflows and Pipelines - CI/CD, Machine Learning, and Other Kubernetes Workflows](https://youtu.be/UMaivwrAyTA)
+* [Argo Ansible role: Provisioning Argo Workflows on OpenShift](https://medium.com/@marekermk/provisioning-argo-on-openshift-with-ansible-and-kustomize-340a1fda8b50)
+* [Argo Workflows vs Apache Airflow](http://bit.ly/30YNIvT)
+* [CI/CD with Argo on Kubernetes](https://medium.com/@bouwe.ceunen/ci-cd-with-argo-on-kubernetes-28c1a99616a9)
+* [Running Argo Workflows Across Multiple Kubernetes Clusters](https://admiralty.io/blog/running-argo-workflows-across-multiple-kubernetes-clusters/)
+* [Open Source Model Management Roundup: Polyaxon, Argo, and Seldon](https://www.anaconda.com/blog/developer-blog/open-source-model-management-roundup-polyaxon-argo-and-seldon/)
+* [Producing 200 OpenStreetMap extracts in 35 minutes using a scalable data workflow](https://www.interline.io/blog/scaling-openstreetmap-data-workflows/)
+* [Argo integration review](http://dev.matt.hillsdon.net/2018/03/24/argo-integration-review.html)
+* TGI Kubernetes with Joe Beda: [Argo workflow system](https://www.youtube.com/watch?v=M_rxPPLG8pU&start=859)
+
+## Project Resources
+
+* [Argo Project GitHub organization](https://github.com/argoproj)
+* [Argo Website](https://argoproj.github.io/)
+* [Argo Slack](https://argoproj.github.io/community/join-slack)
 
-## Getting Started
+## Security
 
-For set-up information and running your first Workflows, please see our [getting started guide](quick-start.md).
+See [SECURITY.md](https://github.com/argoproj/argo-workflows/blob/master/SECURITY.md).