ci: add linting pipeline for markdown files with prettier

.github/workflows/markdown-lint.yml

@@ -0,0 +1,32 @@
+name: Lint Markdown with Prettier
+
+on:
+  push:
+    paths:
+      - '**/*.md'
+  pull_request:
+    paths:
+      - '**/*.md'
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '16'
+
+      - name: Install dependencies
+        run: npm install --save-dev prettier
+
+      - name: Run Prettier check
+        run: npx prettier --check '**/*.md'
+
+      - name: Prettier report
+        if: failure()
+        run: echo "Markdown files are not formatted correctly."