Add PR template

Author: MateSaary

.github/pull_request_template.md

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+### What type of PR is this?
+
+(feature/bug/documentation/other)
+
+### What this PR does / Why we need it?
+
+### Special notes for your reviewer
+
+### Test Coverage
+#### Guidelines for CAD investigations
+- New investgations should be accompanied by unit tests and/or step-by-step manual tests in the investigation README.
+- E2E testing is desired for actioning investigations. See README for more info on investigation graduation process.
+
+#### Test coverage checks
+- [ ] Added tests
+- [ ] Created jira card to add unit test
+- [ ] This PR may not need unit tests
+
+### Pre-checks (if applicable)
+- [ ] Ran unit tests locally
+- [ ] Validated the changes in a cluster
+- [ ] Included documentation changes with PR