chore: add pr template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- PULL REQUEST TEMPLATE -->
+<!-- (Update "[ ]" to "[x]" to check a box) -->
+
+### Basic Checks
+
+Have you run `rush change` for this change?
+
+- [ ] Yes
+- [ ] No
+
+If **No**, please run `rush change` before, this is necessary.
+
+If adding a **new feature**, the PR's description includes:
+
+- [ ] Reason for adding this feature
+- [ ] How to use
+- [ ] A basic example
+
+**Does this PR introduce a breaking change?** (check one)
+
+- [ ] Yes
+- [ ] No
+
+If yes, please describe the impact and migration path for existing applications:
+
+### Summary
+
+### Detail
+
+### How to test it