docs: add pull_request_template.md

Add pull_request_template.md

Signed-off-by: Saul Paredes <saulparedes@microsoft.com>

.github/pull_request_template.md

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+<!--
+COMMENT BLOCKS WILL NOT BE INCLUDED IN THE PR.
+Feel free to delete sections of the template which do not apply to your PR, or add additional details
+-->
+
+###### Merge Checklist  <!-- REQUIRED -->
+<!-- You can set them now ([x]) or set them later using the Github UI -->
+<!-- **All** boxes should be checked before merging the PR *(just tick any boxes which don't apply to this PR)* -->
+- [ ] Followed patch format from upstream recommendation: https://github.com/kata-containers/community/blob/main/CONTRIBUTING.md#patch-format
+- [ ] Included a single commit in a given PR - at least unless there are related commits and each makes sense as a change on its own.
+- [ ] Merged using "create a merge commit" rather than "squash and merge" (or similar)
+- [ ] genPolicy only: Builds on Windows
+- [ ] genPolicy only: Updated sample YAMLs' policy annotations, if applicable
+
+###### Summary <!-- REQUIRED -->
+<!-- Quick explanation of the changes. -->
+
+###### Associated issues  <!-- optional -->
+<!-- Link to Github issues if possible. -->
+
+###### Links to CVEs  <!-- optional -->
+<!-- https://nvd.nist.gov/vuln/detail/CVE-YYYY-XXXX -->
+
+###### Test Methodology
+<!-- How was this test validated? i.e. local build, pipeline build etc. -->