feat: add pr template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,11 @@
+## :pushpin: Type of PR
+
+<!-- _Bugfix, Feature, Code style update (formatting, local variables), Refactoring (no functional changes, no api changes), Build related changes, CI related changes, Other..._  -->
+
+## :recycle: Current situation
+
+<!-- _Describe the current situation. Explain current problems, if there are any. Be as descriptive as possible (e.g., including examples or code snippets)._ -->
+
+## :bulb: Proposed solution
+
+<!-- _Describe the proposed solution and changes. How does it affect the project? How does it affect the internal structure (e.g., refactorings)?_ -->