✨ feat: Add contributor-helper workflow and PR template

Author: arvinxx

.github/PULL_REQUEST_TEMPLATE.md

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+#### 💻 变更类型 | Change Type
+
+<!-- For change type, change [ ] to [x]. -->
+
+- \[ ] ✨ feat
+- \[ ] 🐛 fix
+- \[ ] 💄 style
+- \[ ] 🔨 chore
+- \[ ] 📝 docs
+
+#### 🔀 变更说明 | Description of Change
+
+<!-- Thank you for your Pull Request. Please provide a description above. -->
+
+#### 📝 补充信息 | Additional Information
+
+<!-- Add any other context about the Pull Request here. -->

.github/workflows/contributor-help.yml

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+name: Contributor Helper
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  contributor:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+
+      - uses: actions-cool/contributor-helper@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          style: 'simple'
+          update-files: 'README.md'
+          update-places: '<!-- CONTRIBUTION GROUP -->/<!-- CONTRIBUTION END -->'
+
+      - name: Commit and push if changed
+        run: |-
+          git diff
+          git config --global user.email "actions@github.com"
+          git config --global user.name "github-actions"
+          git pull
+          git add -A
+          git commit -m "🤖 docs: Auto update contributors" || exit 0
+          git push