Add Markdown Linting (#24)

.github/workflows/markdown-lint.yml

@@ -0,0 +1,22 @@
+name: markdown-linting
+
+on:
+  push:
+    branches: 
+      - '**'
+  pull_request:
+    branches: 
+      - '**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.base.ref }}
+      - name: Markdown Linter
+        uses: DavidAnson/markdownlint-cli2-action@v15
+        with:
+          globs: '/*.md'