Added pull_request_template.md

Author: mcbarton

.github/pull_request_template.md

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+# Description
+
+Please include a summary of changes, motivation and context for this PR.
+
+Fixes # (issue)
+
+## Type of change
+
+Please tick all options which are relevant.
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Requires documentation updates
+
+# Testing
+
+Please describe the test(s) that you added and ran to verify your changes.
+
+## Test(s) description
+
+**Test Configuration**:
+
+* OS:
+
+# Checklist:
+
+- [ ] I have added tests that prove my fix is effective and/or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have used understandable variable names
+- [ ] I have squashed my commits into a single commit ready for review
+- [ ] I have run `git-clang-format HEAD~` on my changes
+- [ ] I have made corresponding changes to the documentation
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas