Create CONTRIBUTING.md

Author: Aniketh01

CONTRIBUTING.md

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+## How to contribute to NaWab
+
+### <ins>Guidelines</ins>
+
+If you want to contribute to the project, feel free to send a pull request.
+
+- Commit messages should follow the following template:
+```
+component_name: one-line description
+<empty line>
+Extended multi-line description that includes
+the problem you are solving and how it is solved.
+```
+`component_name` is the concept/component whic this commit changes.
+
+For eg:
+
+- Telegram Bot: Add the stop command
+- Nawab: Inital Argparse integration
+- Twitter_bot: Add user account to blacklist
+
+
+Please pay attention to punctuation. In particular:
+- `one-line description` does *not* start with a Capital letter.
+- there is *no dot* at the end of `one-line description`.
+- `Extended multi-line description` is full English sentenses with Capital letters and dots.
+
+Also note:
+- If you commit fixes an issue, please include `Fixes #NNN` line into commit message
+(where `NNN` is issue number). This will auto-close the issue. If you need to mention
+an issue without closing it, add `Update #NNN`.
+- Rebase your pull request onto the master branch before submitting.