Create pull_request_template.md

.github/pull_request_template.md

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+## Description of pull request
+
+<!--- Insert text here -->
+
+
+## Status of pull request
+<!--- You might be creating this pull request hoping for feedback or intentionally half-way though the development process. -->
+- [ ] Feedback wanted 
+- [ ] Under development
+- [ ] Ready to merge
+
+## Checklist of required changes before merge will be approved
+- [ ] Test file(s) added
+- [ ] Version and date string updated in changed source files
+- [ ] Relevant `\changes` entries in source included
+- [ ] Relevant `changes.txt` updated
+- [ ] `ltnewsX.tex` updated