feat: add github settings

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment(please complete the following information):**
+Please use `flutter doctor -v` to show your flutter environment, and add your `markdown_widget` version too
+
+**Platform**
+Does the problem appear on the **Web** or on the **Mobile**？
+
+**Source data**
+Please provide a minimal source data that can help locating the problem

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/build_releases.yml

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+name: Flutter CI
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-release-linux:
+    runs-on: ubuntu-22.04
+    if: startsWith(github.ref, 'refs/tags/')
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          architecture: x64
+          flutter-version: '3.16.5'
+      - name: Install dependencies
+        run: sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-0 libgtk-3-dev libblkid1 liblzma5
+      - name: Install project dependencies
+        run: flutter pub get
+      - name: Generate intermediates
+        run: flutter pub run build_runner build --delete-conflicting-outputs
+      - name: Enable linux build
+        run: flutter config --enable-linux-desktop
+      - name: Build artifacts
+        run: flutter build linux --release
+      - name: Archive Release
+        uses: thedoctor0/zip-release@master
+        with:
+          type: 'zip'
+          filename: markdown-${{github.ref_name}}-linux.zip
+          directory: build/linux/x64/release/bundle
+      - name: Linux Release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.ACTION_TOKEN }}
+        with:
+          files: build/linux/x64/release/bundle/markdown-${{github.ref_name}}-linux.zip
+
+  build-and-release-windows:
+    runs-on: windows-latest
+    if: startsWith(github.ref, 'refs/tags/')
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          architecture: x64
+          flutter-version: '3.16.5'
+      - name: Install project dependencies
+        run: flutter pub get
+      - name: Generate intermediates
+        run: flutter pub run build_runner build --delete-conflicting-outputs
+      - name: Enable windows build
+        run: flutter config --enable-windows-desktop
+      - name: Build artifacts
+        run: flutter build windows --release
+      - name: Archive Release
+        uses: thedoctor0/zip-release@master
+        with:
+          type: 'zip'
+          filename: markdown-${{github.ref_name}}-windows.zip
+          directory: build/windows/runner/Release
+      - name: Windows Release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.ACTION_TOKEN }}
+        with:
+          files: build/windows/runner/Release/markdown-${{github.ref_name}}-windows.zip
+
+  build-and-release-macos:
+    runs-on: macos-latest
+    if: startsWith(github.ref, 'refs/tags/')
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          architecture: x64
+          flutter-version: '3.16.5'
+      - name: Install project dependencies
+        run: flutter pub get
+      - name: Generate intermediates
+        run: flutter pub run build_runner build --delete-conflicting-outputs
+      - name: Enable macOS build
+        run: flutter config --enable-macos-desktop
+      - name: Build artifacts
+        run: flutter build macos --release
+      - name: Archive Release
+        uses: thedoctor0/zip-release@master
+        with:
+          type: 'zip'
+          filename: markdown-${{github.ref_name}}-macos.zip
+          directory: build/macos/Build/Products/Release
+      - name: macOS Release
+        uses: softprops/action-gh-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.ACTION_TOKEN }}
+        with:
+          files: build/macos/Build/Products/Release/markdown-${{github.ref_name}}-macos.zip

.github/workflows/build_web.yml

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+name: Build & deploy
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install Flutter
+        uses: subosito/flutter-action@v1
+        with:
+          channel: 'stable'
+          flutter-version: '3.16.5'
+
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Test project
+        run: flutter test
+
+      - name: Build release project
+        run: flutter build web
+
+      - name: Show dir
+        run: ls && cd example && ls
+
+      - name: Download medias
+        run: dart run build_script/script_convert_asset.dart
+
+      - name: Upload production-ready build files
+        uses: actions/upload-artifact@v2
+        with:
+          name: production-files
+          path: build/web
+
+  deploy:
+    name: Deploy
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/dev'
+
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v2
+        with:
+          name: production-files
+          path: build/web
+
+      - name: Deploy to gh-pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.ACTION_TOKEN }}
+          publish_dir: build/web

.github/workflows/coverage_action.yml

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+name: Test Coveralls
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: subosito/flutter-action@v1
+        with:
+          channel: 'stable'
+          flutter-version: '3.16.5'
+      - run: flutter pub get
+      - run: flutter packages pub run build_runner build
+      - run: flutter test --coverage ./test/
+      - uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: coverage/lcov.info