Create contributing.md

Author: sadanandpai

contributing.md

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+### Contribution Guide
+- Feel free to contribute to this repo by raising the __pull request__
+- If you do not know to raise pull request, send an email with details to sadypai@gmail.com
+- Spelling mistakes, improvement of answers, code comments, rephrasing the questions / points, additional details, quality references and such contributions are highly appreciated
+
+#### Question contribution
+- The question should be unambiguous and as generic as possible
+- Only JavaScript questions with coding solutions are allowed (No theoretical question)
+- Any coding hints to be provided along with the question can be included as example
+- Answer can contain maximum 4 parts
+	- Important points related to solving the question or about the implementation logic - optional but recommended
+	- Solution program (single or multiple solutions) - mandatory
+	- Notes (additional detail about the answer) - optional
+	- References - optional but recommended
+
+#### Standards followed
+- No full stop at the end of the question or points
+- Output of the code is mentioned infront of the statement with comments
+- Code comments should be before or after the code in seperate line
+- Driver codes are added only when necessary
+- The difficulty level of the question in general increases with the question number
+- Follow the existing format of markdown and code