Add links checker workflow

.github/workflows/links_checker.yml

@@ -0,0 +1,23 @@
+name: LinksChecker
+
+on:
+  # Triggers the workflow on push or pull request events but only for the "master" branch
+  push:
+#    branches: [ "main" ]
+#  pull_request:
+#    branches: [ "main" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  links-checker-job:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+
+      - name: Call action jetbrains-academy/links-checker-action
+        uses: jetbrains-academy/links-checker-action@main
+        with:
+          dir: ./