add linefeed check action

Author: jmckenna

.github/workflows/check-crlf.yml

@@ -0,0 +1,20 @@
+# check for Windows CRLF in files
+# homepage: https://github.com/marketplace/actions/check-crlf
+
+name: Check CRLF
+
+on: [push, pull_request]
+
+jobs:
+  Check-CRLF:
+    name: verify that only LF linefeeds are used
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository contents
+        uses: actions/checkout@v4
+
+      - name: Use action to check for CRLF endings
+        uses: erclu/[email protected]
+        with: # ignore directories containing *.csv & data
+          exclude: /demo/