Added Contributing.md

Author: darpanjbora

CONTRIBUTING.md

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+## Guidelines to contribute to this repository
+
+### Follow these steps to make a valid pull request
+
+1. Fork this repo.
+2. Clone your forked repository to your local.
+3. Add any algorithm (**JAVA ONLY**) in its respective folder. (You can create a folder, if it's not there)
+4. Then create a pull request.