Update README.md to reflect maintenance status (#39)

Author: joshkay10

README.md

@@ -1,3 +1,7 @@
+---------
+⚠️ This repository isn’t maintained anymore.
+---------
+
 # Jira TODO
 Create issue for TODO comments
 
@@ -44,4 +48,4 @@ Example workflow:
 
 ### Outputs
 
-- `issues`: Well-formed JSON array containing keys of all newly created issues
+- `issues`: Well-formed JSON array containing keys of all newly created issues