Added pull_request template

Author: nkongenelly

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+**What problems does this PR solve?**
+Provide a short description or reference to the relevant issue, explaining what problems this PR solves.
+
+**An outline of the validation procedure for this feature**
+In addition to automatic tests, has any manual testing been carried out?
+
+**Risk analysis - 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