added cff validation

.github/workflows/cffvalidation.yml

@@ -0,0 +1,25 @@
+### github action to publish a new CITATION.cff 
+##
+name: "cff validation"
+
+## Controls when the workflow will run
+on:
+  push:
+    paths:
+      - CITATION.cff
+
+  ## Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  validate:
+    name: "validate"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out a copy of the repository
+        uses: actions/checkout@v3
+
+      - name: Validate a CITATION.cff from a subdirectory
+        uses: citation-file-format/cffconvert-github-action@2.0.0
+        with:
+          args: "--infile ./CITATION.cff --validate"