Merge branch 'chore/update-active-context-readme' into 'master'

Update active context readme

See merge request !178124



Merged-by: Dmitry Gruzd <dgruzd@gitlab.com>
Approved-by: Dmitry Gruzd <dgruzd@gitlab.com>
Co-authored-by: maddievn <mvanniekerk@gitlab.com>

gems/gitlab-active-context/README.md

@@ -89,4 +89,8 @@ ActiveContext.raw_queues
 
 ## Contributing
 
-TODO
+### Development guidelines
+
+1. Avoid adding too many changes in the monolith, keep concerns in the gem
+1. It's okay to reuse lib-type GitLab logic in the gem and stub it in specs. Avoid duplication this kind of logic into the code for long-term maintainability.
+1. Avoid referencing application logic from the monolith in the gem