feat: update PR template

Author: ChengShi-1

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,6 +12,6 @@
 
 ## Suggestions on how to test this:
 
-## Is there a release notes update needed for this change?:
+## Is there a release notes or changelog update needed for this change?:
 
 ## Additional documentation:

CONTRIBUTING.md

@@ -20,14 +20,23 @@ First of all thank you very much for your interest in contributing to this proje
 
 ## Maintaining the Changelog
 
-We follow the [Keep a Changelog](https://keepachangelog.com/) format for our changelog. When contributing:
+When contributing to this project, it's important to document your changes in the changelog to help users and developers understand what has been added, changed, fixed, or removed between versions. The changelog helps maintain transparency about project evolution and assists users in understanding the impact of updates. We also have another changelog for design system, so for any design system changes, please include them in that changelog.
+
+### When to Add Changelog Entries
+
+**Every pull request should include a changelog entry**
+
+Add a changelog entry for changes, including:
+
+- **Added**: New features, components, or functionality
+- **Changed**: Changes to existing functionality, API modifications, or package updates
+- **Fixed**: Bug fixes and issue resolutions
+- **Removed**: Deprecated features or removed functionality
+
+### How to Add Changelog Entries
 
 1. **Add your changes to the `[Unreleased]` section** at the top of `CHANGELOG.md`
-2. **Categorize your changes** under the appropriate headings:
-   - **Added** for new features
-   - **Changed** for changes in existing functionality
-   - **Removed** for now removed features
-   - **Fixed** for any bug fixes
+2. **Categorize your changes** under the appropriate category(Added, Changed, Fixed, Removed)
 3. **Write clear, concise descriptions** that help users understand the impact of changes
 4. **Include relevant issue numbers** when applicable