Create automation.md (PR automation) (#760)

automation.md

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+# Automation
+
+## Activated automations:
+ 
+ - **Out of the box, github automerge** will merge a PR once everything is green. It is activated from a pull request page.
+ 
+   It won't automatically sync (merge or rebase) the branch with master.    
+ 
+   For more [information](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/automatically-merging-a-pull-request).
+ 
+ - **Autosquash** will automatically update the branch - merge commit (when a new commit lands on master).
+ 
+   It will automatically squash and merge to master once everything is green.
+   
+   It is activated by adding the `autosquash` label. 
+ 
+   For more [information](https://github.com/marketplace/actions/autosquash)
+ 
+ - **Autorebase** will automatically rebase the branch (when a new commit lands on master).
+ 
+   It won't automatically merge to master (this can be done with the first automation).
+   
+   It is activated by adding the `autorebase` label.
+ 
+   For more [information](https://github.com/marketplace/actions/rebase-pull-requests)