[VISOP-3750] Update PR template as the generic GYG one does not fit the interview repo

Author: akos-hrvth

.github/pull_request_template.md

@@ -0,0 +1,5 @@
+# Pull Request
+
+**_ IMPORTANT: If you are a candidate, please do not open a PR or push your changes. _**
+
+Please describe the changes this PR makes, giving a concise but thorough summary of what you changed and why.