add instructions

Author: juli1

CONTRIBUTE.md

@@ -7,6 +7,10 @@ to report issues directly.
 
 ## Publish a new release
 
-We use GitHub release to publish a new version of the plugin
-Make sure you increase the version number in `package.json`
-before triggering a new relase.
+1. Update the version number in `package.json` (see `version` attribute)
+2. Push the change in the repository
+3. Go on https://github.com/codiga/vscode-plugin/releases
+4. Create a new release. The git version tag must match the version in `package.json`
+5. Publish the release
+6. New release is being published on the Microsoft store
+7. Check the release once published (e.g. all functionalities work).