Create PULL_REQUEST_TEMPLATE.md

Author: Andre601

.github/PULL_REQUEST_TEMPLATE/PULL_REQUEST_TEMPLATE.md

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+[Pull requests]: https://github.com/botblock/JavaBotBlockAPI/pulls
+[guidelines]: https://github.com/botblock/JavaBotBlockAPI/blob/master/.github/CONTRIBUTING.md
+
+## Check
+Please make sure you checked the following things first:
+- [ ] There is no open PR in the [Pull requests] page containing your changes.
+- [ ] You follow the [Contributing Guidelines][guidelines] about comments and such.
+
+## Summary
+> What does this PR contain? Mention any changes you made and if they would break stuff.  
+> If your PR is related to an issue and closes it, mention it with `closes #<issue ID>`
+<!-- Write below this line to prevent formatting issues -->