Added pull request template. (canonical#334)

Signed-off-by: Utkarsh Bhatt <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+## 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)
+- [ ] CleanCode (Code refactor, test updates, does not introduce functional changes)
+- [ ] Documentation update (Doc only change)
+
+## How Has This Been Tested?
+
+> **_NOTE:_** All functional changes should accompany corresponding tests (unit tests, functional tests etc).
+
+Please describe the addition/modification of tests done to verify this change. Please also list any relevant details for your test configuration.
+
+## Contributor's Checklist
+
+Please check that you have:
+
+- [ ] self-reviewed the code in this PR.
+- [ ] added code comments, particularly in hard-to-understand areas.
+- [ ] updated the user documentation with corresponding changes.
+- [ ] added tests to verify effectiveness of this change.