docs: add new pull request template

.github/pull_request_template.md

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+<!--
+
+In order to have a good experience with our community, we recommend that you read the [contributing guidelines](https://github.com/ajschroeder/proxmox-packer-examples/blob/main/.github/CONTRIBUTING.md) for making a pull request.
+
+-->
+
+# <!-- Intentionally left blank. -->
+
+## Summary of Pull Request
+
+<!--
+    Please provide a clear and concise description of the pull request.
+-->
+
+## Type of Pull Request
+
+<!--
+    Please check the one that applies to this pull request using "[x]".
+-->
+
+- [ ] This is a bugfix. `type/bug`
+- [ ] This is an enhancement or feature. `type/feature` or `type/enhancement`
+- [ ] This is a documentation update. `type/docs`
+- [ ] This is a refactoring update. `type/refactor`
+- [ ] This is a chore. `type/chore`
+- [ ] This is something else.
+      Please describe:
+
+## Related to Existing Issues
+
+<!--
+  Is this related to any GitHub issue(s)?
+
+  For example:
+  - Resolves #1234
+-->
+
+Issue Number: N/A
+
+## Test and Documentation Coverage
+
+<!--
+    Please check the one that applies to this pull request using "[x]".
+-->
+
+- [ ] Tests have been completed.
+- [ ] Documentation has been added or updated.
+
+## Breaking Changes?
+
+<!--
+    Please check the one that applies to this pull request using "[x]".
+-->
+
+- [ ] Yes, there are breaking changes.
+- [ ] No, there are no breaking changes.
+
+<!--
+    If this pull request contains a breaking change, please describe the impact and mitigation path.
+-->