chore: add pull request templates

.github/PULL_REQUEST_TEMPLATE.md

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+# How to submit a pull request
+
+This document was modified from [grappafinance/cross-margin-engine](https://github.com/grappafinance/cross-margin-engine).
+
+## Summary
+
+Describe the changes made in your pull request here.
+
+## Details
+
+Any implementation detail worth pointing out, if any.
+
+## Todo
+
+Breakdown the progress of the PR for everyone to see what else you intend to include in this PR.
+
+- [ ] Draft implementation for `function`
+- [ ] Unit tests for `function`
+
+## Checklist
+
+Ensure you completed **all of the steps** below before submitting your pull request:
+
+- [ ] Add [natspec](https://docs.soliditylang.org/en/latest/natspec-format.html) for all functions / parameters
+- [ ] Ran `forge snapshot`
+- [ ] Ran `forge fmt`
+- [ ] Ran `forge test`
+- [ ] [Triage Slither issues](../README.md#triage-issues), and post uncertain ones in the PR