Create contributing.md

Author: thatshubham

contributing.md

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+### Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one to avoid duplicates.
+- Projects should be under active development.
+- Separate pull request for each suggestion.
+- Keep descriptions short and simple.
+
+
+Thank you for your suggestions!
+
+### Updating your Pull Request
+
+Sometimes, a maintainer will ask you to edit your Pull Request before it is included. This is normally due to spelling errors. [Here](https://github.com/RichardLitt/knowledge/blob/master/github/amending-a-commit-guide.md) is a write up on how to change a Pull Request, and the different ways you can do that.