add PULL_REQUEST_TEMPLATE.md and ISSUE_TEMPLATE

Signed-off-by: tanjunchen <tanjunchen20@gmail.com>

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Description
+
+<!--
+Please provide a clear and concise description of this PR:
+- What problem does it solve?
+- Why is this change needed?
+- What is the overall approach?
+-->
+
+FIX #xxxx  
+<!-- Link the existing issue(s) this PR resolves, e.g.:
+FIX #1234
+-->
+
+---
+
+## Checklist (Required)
+
+Before submitting this PR, please ensure that all the following items are completed:
+
+- [ ] All code changes pass the [`pre-commit`](https://github.com/baidu/vLLM-Kunlun/blob/main/CONTRIBUTING.md) checks.
+- [ ] Commits are signed off using `git commit -s`.
+- [ ] The PR title is properly classified (see below).
+
+---
+
+## PR Type
+
+Please prefix the PR title with one or more of the following labels to help reviewers quickly understand the nature of the change:
+
+- `[Feature]` – New features or enhancements (e.g. Attention, Communicator, Kernel, Worker, etc.)
+- `[Bugfix]` – Bug fixes
+- `[CI/Build]` – CI, build system, or infrastructure improvements
+- `[Doc]` – Documentation updates or fixes
+- `[Misc]` – Other changes that do not fit the above categories (use sparingly)
+
+> **Note:** If the PR spans multiple categories, include all relevant prefixes.
+
+---
+
+<details>
+<summary><b>Detailed Checklist (Click to Expand)</b></summary>
+
+<p>Thank you for contributing to <b>vLLM Kunlun</b>!  
+To help us maintain high code quality and streamline the review process, please ensure your PR meets the following requirements.</p>
+
+<h3>1. Code Quality</h3>
+
+<ul>
+    <li>All linting and formatting checks pass (<code>pre-commit</code>).</li>
+    <li>The code is well-structured and sufficiently documented.</li>
+    <li>The change is designed with maintainability and readability in mind.</li>
+</ul>
+
+<h3>2. Testing</h3>
+
+<ul>
+    <li>Relevant unit tests are added or updated.</li>
+    <li>Integration tests are included when applicable.</li>
+    <li>Existing tests continue to pass.</li>
+</ul>
+
+<h3>3. DCO Compliance</h3>
+
+<p>This project follows the
+<a href="https://github.com/vllm-project/vllm/blob/main/DCO">Developer Certificate of Origin (DCO)</a>.</p>
+
+<ul>
+    <li>All commits include a <code>Signed-off-by:</code> line.</li>
+    <li>Use <code>git commit -s</code> to automatically add the sign-off.</li>
+</ul>
+
+<h3>4. Review Expectations</h3>
+
+<p>During the review process, maintainers may:</p>
+
+<ul>
+    <li>Request code refactoring or additional tests.</li>
+    <li>Ask for clarifications on design decisions.</li>
+    <li>Suggest performance, stability, or maintainability improvements.</li>
+</ul>
+
+<p>We appreciate your patience and collaboration throughout the review process!</p>
+
+</details>