Create link_check.yaml

.github/workflows/link_check.yaml

@@ -0,0 +1,29 @@
+name: Link Checker
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check-links:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up R
+      uses: r-lib/actions/setup-r@v2
+
+    - name: Install dependencies
+      run: |
+        install.packages('remotes')
+        remotes::install_cran('urlchecker')
+
+    - name: Check links
+      run: |
+        urlchecker::url_check()