Added Category interface for issue categories
Added Category interface for issue categories

5calls/react-dev,tinyels/react-dev,5calls/5calls,cdoremus/5calls-react-port,cdoremus/5calls-react-port,tinyels/react-dev,5calls/5calls,5calls/5calls,5calls/react-dev,5calls/react-dev,5calls/5calls,tinyels/react-dev