Create PULL_REQUEST_TEMPLATE.md

Author: tarokkk

.github/PULL_REQUEST_TEMPLATE.md

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+| Q               | A
+| --------------- | ---
+| Bug fix?        | no|yes
+| New feature?    | no|yes
+| API breaks?     | no|yes
+| Deprecations?   | no|yes
+| Related tickets | fixes #X, partially #Y, mentioned in #Z
+| License         | Apache 2.0
+
+
+### What's in this PR?
+<!-- Explain the contents of the PR. Give an overview about the implementation, which decisions were made and why. -->
+
+
+### Why?
+<!-- Which problem does the PR fix? (Please remove this section if you linked an issue above) -->
+
+
+### Additional context
+<!-- Additional information we should know about (eg. edge cases, steps you followed to test the implementation) (Please remove this section if you don't need it) -->
+
+
+### Checklist
+<!-- Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields. -->
+
+- [ ] Implementation tested (with at least one cloud provider)
+- [ ] Error handling code meets the [guideline](https://github.com/banzaicloud/pipeline/blob/master/docs/error-handling-guide.md)
+- [ ] Logging code meets the guideline (TODO)
+- [ ] User guide and development docs updated (if needed)
+- [ ] Related Helm chart(s) updated (if needed)
+
+### To Do
+<!-- (Please remove this section if you don't need it.) -->
+- [ ] If the PR is not complete but you want to discuss the approach, list what remains to be done here