Pr template (#635)

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for contributing to the project!
+Please help us keep this project in good shape by going through this checklist.
+Replace the empty checkboxes [ ] below with checked ones [X] as they are completed
+Remember, you can preview this before saving it.
+-->
+
+<!-- You can remove this first section if you have contributed before -->
+
+### First time contributor checklist:
+
+- [ ] I have read the [README](https://github.com/digidem/mapeo-desktop/blob/master/README.md) 
+
+### Contributor checklist:
+
+- [ ] My commits are in nice logical chunks with [good commit messages](http://chris.beams.io/posts/git-commit/)
+- [ ] If my changes depend upon an update to a dependency, I have updated the package-lock.json file using `npm install --package-lock`
+- [ ] I have used the app myself and all of the buttons work.
+- [ ] I have tested the application with [the commandline
+  tool](https://github.com/datproject/dat).
+- [ ] My changes have been tested with the integration tests, and all tests pass.
+- [ ] My changes are ready to be shipped to users on Mac and Linux.
+
+### Description
+
+<!--
+Describe briefly what your pull request changes. Focus on the value provided to users.
+
+Does it address any outstanding issues in this project?
+  Reference an issue with the hash symbol: "#222"
+  If you're fixing it, use something like "Fixes #222"
+
+Please write a summary of your test approach:
+  - Did you write any new tests?
+  - What operating systems did you test with? (please use specific versions: http://whatsmyos.com/)
+  - What other devices did you test with? (other Desktop devices, Android, Android Simulator, iOS, iOS Simulator)
+-->
+