Create PULL_REQUEST_TEMPLATE.md

Author: wintondeshong

PULL_REQUEST_TEMPLATE.md

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+- [ ] Related GitHub issue(s) linked in PR description
+- [ ] Destination branch merged, built and tested with your changes
+- [ ] Code formatted and follows best practices and patterns
+- [ ] Code builds cleanly (no _additional_ warnings or errors)
+- [ ] Manually tested
+- [ ] Automated tests are passing
+- [ ] No _decreases_ in automated test coverage
+- [ ] Documentation updated (readme, docs, comments, etc.)
+- [ ] Localization: No hard-coded error messages in code files (_minimally_ in string constants)