Create CONTRIBUTOR.md

CONTRIBUTOR.md

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+# How to Contribute
+
+- Before starting, please checkout your new branch from the 'develop' branch and submit your PRs to
+  it as well.
+- Check the issues tab and choose for yourself what issues you can solve.
+- Apart from solving the issues, any PR which improves existing coding practices or use
+  implementation of new design patterns and principles are allowed and welcome.
+- If you are solving an issue, checkout your branch from 'develop' and name it in the following convention:
+
+    ```
+    issue_<number>_<developer_name> Example: issue_2_shobu95
+    ```