Update CONTRIBUTING.md

NaturalIntelligence · May 11, 2018 · 0e910f9 · 0e910f9
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@@ -24,3 +24,7 @@ Note that publishing changes or accepting any PR may take time. So please keep p
 ### Guidelines for first time contributors
 
 * https://github.com/Roshanjossey/first-contributions
+* Please refrain to work on multiple cards. As your friends and colleagues to attempt rest cards
+* Please claim the issue and clear your doubts before raising PR. So other users will not start working on the same issue.
+* Mention the issue number either in PR detail or in commit message.
+* Keep increasing the level of challenge.