Update action.yml with description

Author: vuillaut

action.yml

@@ -1,4 +1,5 @@
-name: Contrib metadata check
+name: Contributors metadata check
+description: contrib-checker checks if code contributors are properly listed in metadata files such as CITATION.cff and codemeta.json based on the git history
 
 inputs:
   github_token:
@@ -44,4 +45,4 @@ runs:
         PR_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
         ACTION_MODE: ${{ inputs.mode }}
         ACTION_IGNORE_EMAILS: ${{ inputs.ignore_emails }}
-        ACTION_IGNORE_LOGINS: ${{ inputs.ignore_logins }}
+        ACTION_IGNORE_LOGINS: ${{ inputs.ignore_logins }}