Add templates for contribution and PR

Author: robincher

.github/CONTRIBUTING.md

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+## Contributing:
+We welcome your involvement, be it fixing bugs or implementing new features that you find relevant to this library.
+
+To contribute, you may follow the steps below:
+1. Fork the repo
+2. Create a new feature branch from `master` to work on your contribution
+3. Create a pull request back when you are done
+
+Please refer to the ISSUES and PULL REQUEST templates when raising them. The reviewers will evaluate the request before merging into `master`
+
+You can raise an issue within this Github repository to kick-start the discussion first.

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue number)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+## How Has This Been Tested?
+
+Please describe or list the test cases that you ran to verify your changes, and provide instructions so we can reproduce. 
+