Create CONTRIBUTION.md

Author: sameersyd

CONTRIBUTION.md

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+## Welcome Dev!, Thanks for making our BoxFeed App great.
+
+### What you can do
+You can contribute us by filing issues, bugs and PRs.
+
+### Contributing guidelines:
+- Open issue regarding proposed change.
+- Repo owner will contact you there.
+- If your proposed change is approved, Fork this repo and do changes.
+- Open PR against latest `dev` branch. Add nice description in PR.
+- You're done!