Create pull_request_template.md

.github/pull_request_template.md

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+### Guidelines 
+
+1. You must run the `spotlessApply` task before commiting, either through Android Studio or with `./gradlew spotlessApply`.
+2. A PR should be focused and contained. If you are changing multiple unrelated things, they should be in separate PRs.
+3. A PR should fix a bug or solve a problem - something that only you would use is not necessarily something that should be published.
+4. Give your PR a detailed title and description - look over your code one last time before actually creating the PR. Give it a self-review.
+
+**If you do not follow the guidelines, your PR will be rejected.**