Add CI Action to check broken links in Markdown files

Author: BMatischen01

.github/workflows/check-broken-links.yaml

@@ -0,0 +1,14 @@
+name: Check Markdown links
+
+on:
+  workflow_run:
+    workflows: ["Receive Pull Request"]
+    types:
+      - completed
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: tcort/github-action-markdown-link-check@v1.1.2