Updates contributing.md

Author: StephenNneji

CONTRIBUTING.md

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+Contributing to Python-RAT
+==========================
+Everyone is welcome to contribute to the Python-RAT project by either opening an issue (please check that the 
+issue has not been reported already) or submitting a pull request.
+
+Create Developer Environment
+----------------------------
+This project targets Python 3.9 or later. Install an appropriate version of Python and other dependencies
+
+Then create a fork of the python-RAT repo, and clone the fork
+
+    git clone https://github.com/<username>/python-RAT.git
+    cd python-RAT
+
+And finally create a separate branch to begin work
+
+    git checkout -b new-feature
+
+Once complete submit a [pull request](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork) via GitHub. 
+Ensure to rebase your branch to include the latest changes on your branch and resolve possible merge conflicts.
+
+Unit-testing and coverage
+-------------------------
+Python-RAT will use the **unittest** module for testing. Proper documentation and unit tests is highly recommended.
+
+Documentation
+-------------
+The documentation will be hosted on GitHub pages
+
+Style guidelines
+----------------
+* Docstrings should be written in the reStructuredText format.