Create pull_request_template.md

.github/pull_request_template.md

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+- [ ] I have read the [contributing guidelines](https://github.com/willstocks-tech/dynamically-polyfill-features-for-a-script/blob/master/CONTRIBUTING.md)
+
+###  This PR is against the following branch:
+
+- [ ] `master`
+
+- [ ] `develop`
+
+<!-- ### PR is against `master` because: -->
+
+<!-- Reason for PR'ing against master -->
+
+### This PR is for a:
+
+- [ ] Bug fix
+
+- [ ] Enhancement
+
+- [ ] Feature Request
+
+- [ ] Documentation
+
+### It fixes/improves/adds/updates the following:
+
+<!-- Detailed description of what this PR does and why - information is key! :smile: -->
+
+
+### Related issues:
+
+<!-- List of issue id's here - if it fixes them, please ensure a list is entered either as "Closes #" or "Fixes #" so issues are automatically closed -->
+