Update README.md

Author: jspaaks

README.md

@@ -1,2 +1,20 @@
-# gh-action-cff
-github action to check consistency of cff and zenodo citation metadata
+# cffconvert-github-action
+
+GitHub action to check consistency of cff and zenodo citation metadata
+
+
+## Example usage
+
+```yaml
+on: push
+
+jobs:
+  build:
+    name: "cffconvert"
+    runs-on: ubuntu-latest
+    steps:
+      # This step checks out a copy of your repository.
+      - uses: actions/checkout@v2
+      # This step references the directory that contains the action.
+      - uses: citation-file-format/cffconvert-github-action
+```