doc(action): [#3] Document the Github Action

.github/workflows/release.yml

@@ -1,4 +1,4 @@
-name: Publish docker image and release
+name: Create github release
 
 on:
   push:

README.md

@@ -1,6 +1,15 @@
 # bso-ui
 Front-end pour le Baromètre de la Science Ouverte
 
+![example workflow](https://github.com/dataesr/bso-ui/actions/workflows/release.yml/badge.svg)
+
+<br/>
+<br/>
 
 ## Boilerplate
+
 This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+The version number follow [semver](https://semver.org/).
+
+To create a new release, push a new tag to github.