add github pull request template

.github/pull_request_template.md

@@ -0,0 +1,77 @@
+<!-- 🎉🎉🎉 Thank you for the PR!!! 🎉🎉🎉 -->
+
+
+Relates to _in case of new feature, this should point to issue/(s) which describes the feature_
+
+Fixes `#<issue number>`. _in case of a bug fix, this should point to a bug and any other related issue(s)_
+
+Should merge before : _list any PRs that depend on this PR_
+
+Should merge after : _list any PRs that are prerequisites to this PR_
+
+**Description**
+
+<!-- Describe your changes here- ideally you can get that description straight from
+your descriptive commit message(s)! -->
+
+**User facing changes**
+
+Write n/a if not output or log lines changed and no behavior is changed
+
+**Before**
+
+If log/output changes: Paste the current relevant skaffold output
+If behavior changes: describe succinctly the current behavior
+
+**After**
+
+If log/output changes: Paste skaffold output after your change
+If behavior changes: describe succintly the behavior after your change
+
+**Next PRs.**
+
+In this section describe a list of follow up PRs if the current PR is a part of big feature change.
+
+See example #2811
+
+Write n/a if not applicable.
+
+
+**Submitter Checklist**
+
+These are the criteria that every PR should meet, please check them off as you
+review them:
+
+- [ ] Includes [unit tests](../DEVELOPMENT.md#creating-a-pr)
+- [ ] Mentions any output changes.
+- [ ] Adds documentation as needed: user docs, YAML reference, CLI reference.
+- [ ] Adds integration tests if needed.
+
+_See [the contribution guide](../CONTRIBUTING.md) for more details._
+
+Double check this list of stuff that's easy to miss:
+
+- If you are adding [a example to the `examples` dir](https://github.com/GoogleContainerTools/skaffold/tree/master/examples), please copy them to [`integration/examples`](https://github.com/GoogleContainerTools/skaffold/tree/master/integration/examples)
+- Every new example added in [`integration/examples` dir](https://github.com/GoogleContainerTools/skaffold/tree/master/integration/examples), should be tested in [integration test](https://github.com/GoogleContainerTools/skaffold/tree/master/integration)
+
+**Reviewer Notes**
+
+- [ ] The code flow looks good. 
+- [ ] Unit test added.
+- [ ] User facing changes look good.
+
+
+**Release Notes**
+
+Describe any user facing changes here so maintainer can include it in the release notes, or delete this block.
+
+```
+Examples of user facing changes:
+- Skaffold config changes like
+  e.g. "Add buildArgs to `Kustomize` deployer skaffold config."
+- Bug fixes
+  e.g. "Improve skaffold init behaviour when tags are used in manifests"
+- Any changes in skaffold behavior
+  e.g. "Artiface cachine is turned on by default."
+
+```

DEVELOPMENT.md

@@ -238,6 +238,7 @@ When you have changes you would like to propose to skaffold, you will need to:
 1. Ensure the commit message(s) describe what issue you are fixing and how you are fixing it
    (include references to [issue numbers](https://help.github.com/articles/closing-issues-using-keywords/)
    if appropriate)
+1. Add unit tests. Unit test coverage should increase or stay the same with every PR.
 1. [Create a pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/)
 
 ### Reviews