Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+**What problems does this PR solve?**
+Provide a short description or reference to the relevant issue, explaining what problems this PR solves.
+
+**How has the changes been tested?**
+In addition to automatic tests, has any manual testing been carried out?
+
+**Reasons for careful code review**
+If any of the boxes below are checked, extra careful code review should be inititated.
+
+  - [ ] This PR contains code that could remove data