Add release information to readme

README.md

@@ -69,7 +69,7 @@ Production Build
 
 `heroku run python server/manage.py <command> --app <appname>`
 
-### Rollabck
+### Rollback
 
 After doing a rollback under https://data.heroku.com/
 
@@ -121,3 +121,28 @@ Change bucket `Permissions` / `Bucket Policy`
 }
 
 ```
+
+## Release
+
+### Pushing to Production
+
+Whenever you want to do a release, just merge develop into master and push to origin.
+The current master will always be deployed in the evening, if there are new commits that are not yet on Heroku.
+
+### Tagging
+
+Whenever you do a new release, please tag the current commit after merging with the current date:
+
+    git tag -a release/v2019-09-10
+
+`git tag -a` creates an annotated tag, which must have a release message (like a commit message). For now, just repeat the current date, like:
+
+    Release to production on 2019-09-10
+
+You can and should then push the tag to the repo
+
+    git push origin release/v2019-09-10
+
+You can later see the metadata of the tag with
+
+    git show release/v2019-09-10