docs: update readme

This adds pip installation instructions ("bleeding edge" git+https)
and reorganizes badges to separate docs from CI.

README.md

@@ -1,24 +1,29 @@
 # DataLad REDCap extension
 
-| Docs  | CI  | Other  |
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-| [![Documentation Status](https://readthedocs.org/projects/datalad-redcap/badge/?version=latest)](http://docs.datalad.org/projects/redcap/en/latest/?badge=latest)  | [![crippled-filesystems](https://github.com/datalad/datalad-redcap/workflows/crippled-filesystems/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/test_crippledfs.yml) [![docs](https://github.com/datalad/datalad-redcap/workflows/docs/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/docbuild.yml) |  |
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-| **Docs** | [![Documentation Status](https://readthedocs.org/projects/datalad-redcap/badge/?version=latest)](http://docs.datalad.org/projects/redcap/en/latest/?badge=latest) |
-|:---------|:------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **CI**   | [![crippled-filesystems](https://github.com/datalad/datalad-redcap/workflows/crippled-filesystems/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/test_crippledfs.yml) [![docs](https://github.com/datalad/datalad-redcap/workflows/docs/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/docbuild.yml) |
-
+[![docs](https://github.com/datalad/datalad-redcap/workflows/docs/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/docbuild.yml)
 
 [![crippled-filesystems](https://github.com/datalad/datalad-redcap/workflows/crippled-filesystems/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/test_crippledfs.yml)
-[![docs](https://github.com/datalad/datalad-redcap/workflows/docs/badge.svg)](https://github.com/datalad/datalad-redcap/actions/workflows/docbuild.yml)
 [![Documentation Status](https://readthedocs.org/projects/datalad-redcap/badge/?version=latest)](http://docs.datalad.org/projects/redcap/en/latest/?badge=latest)
 
 This DataLad extension provides convenience commands for exporting data from REDCap into DataLad datasets.
 Information about the RedCAP project can be found at https://project-redcap.org/.
 
 The extension is in early development.
 
+## Installation
+The extension has no official release yet, but you can install the *bleeding edge* version using pip, directly from GitHub.
+This will also install the latest development version of [DataLad Next](https://github.com/datalad/datalad-next) extension.
+Using a virtual environment is recommended.
+Example installation:
+
+``` bash
+# create and enter a new virtual environment (optional)
+$ virtualenv --python=python3 ~/env/dl-redcap
+$ source ~/env/dl-redcap/bin/activate
+# install from GitHub main branch
+$ python -m pip install git+https://github.com/datalad/datalad-redcap.git@main
+```
+
 ## Commands
 - `export-redcap-form`: Export records from selected forms (instruments)
 - `export-redcap-report`: Export a report that was defined in a project