Create pull_request_template.md

.github/pull_request_template.md

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+<!--- Hi, thanks for considering make a PR contribution to Snap Hutao, we appreciate your work. -->
+<!--- Before you create this PR, please fill the following form and checklist -->
+
+## Description
+
+<!--- Describe your changes -->
+
+## Related Issue
+
+<!--- If there's an associated issue, please use [GitHub Keyword](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/using-keywords-in-issues-and-pull-requests) to link it -->
+<!-- e.g. fix #999, resolve #999, close #999>
+
+## Checklist
+
+- [ ] The target PR branch is `develop` branch