update README.md

Author: prohde

README.md

@@ -1,3 +1,7 @@
+[![License: AGPL v3](https://img.shields.io/github/license/SDM-TIB/ckanext-citation?color=blue)](LICENSE.md)
+
+[![CKAN](https://img.shields.io/badge/ckan-2.10-orange.svg?style=flat-square)](https://github.com/ckan/ckan/tree/2.10) [![CKAN](https://img.shields.io/badge/ckan-2.9-orange.svg?style=flat-square)](https://github.com/ckan/ckan/tree/2.9)
+
 # ckanext-citation
 
 `ckanext-citation` is a multi-format citation export extension for CKAN.
@@ -12,16 +16,16 @@ It adds BibTeX, RIS, EndNote (.enw), APA, ACM Reference Format, and CSL-JSON exp
 - ACM Reference Format
 - CSL-JSON
 
-## Integration steps
+## Installation
+
+As usual for CKAN extensions, you can install `ckanext-citation` as follows:
 
 ```bash
-source /usr/lib/ckan/default/bin/activate
-cd /usr/lib/ckan/default/src
-# copy this ckanext-citation/ folder here, then:
-pip install -e ckanext-citation/
+git clone git@github.com:SDM-TIB/ckanext-citation.git
+pip install -e ./ckanext-citation
 ```
 
-Add `citation` to `ckan.plugins` in your CKAN config, restart CKAN.
+Afterward, add `citation` to the plugins in your `ckan.ini`.
 
 ## Testing
 
@@ -31,8 +35,8 @@ pip install -r requirements-test.txt
 pytest -v --cov=ckanext.citation --cov-report=term-missing
 ```
 
-Runs automatically on push/PR via `.github/workflows/test.yml`. See
-`tests/README.md` for what is and isn't covered (short version: the
-formatter logic is fully unit tested without needing CKAN installed;
-there's no Docker/Postgres/Solr integration job against a real CKAN
-instance yet).
+The formatter logic is fully unit tested without needing CKAN installed; there is no Docker/Postgres/Solr integration job against a real CKAN instance yet (see `tests/README.md`).
+
+## License
+
+`ckanext-citation` is licensed under AGPL-3.0, see the [license file](LICENSE.md).