Include GH Action for checking CITATION.cff

.github/workflows/citation-check.yaml

@@ -0,0 +1,20 @@
+on:
+    push:
+      paths:
+        - CITATION.cff
+    workflow_dispatch:
+
+  name: CITATION.cff
+  jobs:
+    Validate-CITATION-cff:
+      runs-on: ubuntu-latest
+      name: Validate CITATION.cff
+      env:
+        GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+
+        - name: Validate CITATION.cff
+          uses: dieghernan/cff-validator@v3