Add GitHub action for linting markdown files

sp-files/.github/workflows/markdown-style-checks.yml

@@ -0,0 +1,15 @@
+name: "Linter for Markdown"
+
+on: [push, pull_request]
+
+jobs:
+  markdown-lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0     
+      - uses: DavidAnson/markdownlint-cli2-action@v16
+        with:
+          config: ".markdownlint.json"
+

sp-files/.markdownlint.json

@@ -0,0 +1,16 @@
+{
+    "default": false,
+    "MD003": { "style": "atx" },
+    "MD013": { "code_blocks": false, "tables": false, "stern": true, "line_length": 80},
+    "MD014": true,
+    "MD018": true,
+    "MD022": true,
+    "MD023": true,
+    "MD026": { "punctuation": ".,;。，；"},
+    "MD031": { "list_items": false},
+    "MD032": true,
+    "MD035": true,
+    "MD042": true,
+    "MD045": true,
+    "MD052": true
+}