[FEAT] updating documentation

CONTRIBUTING.md

@@ -43,6 +43,17 @@ Addresses #bugnumber (in this specific format)
 
 You can contribute to Gitana Core with issues and PRs. Simply filing issues for problems you encounter is a great way to contribute. Contributing implementations is greatly appreciated.
 
+For complete instructions on how to compile see: Building From Source
+
+For quickly compiling and testing your changes do:
+
+```bash
+# For building.
+make build
+
+./bin/gitana
+```
+
 ## Suggested Workflow
 
 We use and recommend the following workflow:

README.md

@@ -8,4 +8,34 @@ Gitana is a lightweight application that will help you sync Grafana dashboards f
 - [ ] Create Helm Chart
 
 # Contributing
-Contributions are very welcome! See our [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
+Contributions are very welcome! See our [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
+
+## Docker images
+
+Docker images are available on [Quay.io](https://quay.io) or [Docker Hub](https://hub.docker.com/).
+
+## Building from source
+
+To build Prometheus from source code, first ensure that you have a working
+Go environment with [version 1.16 or greater installed](https://golang.org/doc/install).
+
+To build the source code you can use the `make build`, which will compile in
+the assets so that Gitana can be run from anywhere:
+
+```bash
+
+    $ mkdir -p $GOPATH/src/github.com/gitana
+    $ cd $GOPATH/src/github.com/gitana
+    $ git clone https://github.com/nicolastakashi/gitana.git
+    $ cd gitana
+    $ make build
+    $ ./gitana sync <args>
+```
+
+The Makefile provides several targets:
+
+  * *build*: build the `gitana`
+  * *fmt*: format the source code
+  * *vet*: check the source code for common errors
+  <!-- * *test*: run the tests -->
+  <!-- * *test-short*: run the short tests -->