Create PR template

Try to optimise creating and reviewing PRs process

.github/pull_request_template.md

@@ -0,0 +1,12 @@
+Resolves: *(direct link to the issue)*
+
+*(short description of the changes and the motivation to make the changes)*
+
+- [ ] I signed [CLA](https://musescore.org/en/cla)
+- [ ] I made sure the code in the PR follows [the coding rules](https://musescore.org/en/handbook/developers-handbook/finding-your-way-around/musescore-coding-rules)
+- [ ] I made sure the code compiles on my machine
+- [ ] I made sure there are no unnecessary changes in the code
+- [ ] I made sure the title of the PR reflects the core meaning of the issue you are solving
+- [ ] I made sure the commit message(s) contain a description and answer the question "Why do those changes fix that particular issue?" or "Why are those changes really necessary as improvements?"
+- [ ] I made sure the commit message title starts with "fix #424242:" if there is a related issue
+- [ ] I created the test (mtest, vtest, script test) to verify the changes I made