Chat with redux state manager

serg1557733 49def55c7b add user names for messages vor 1 Jahr
backend ec14be119a add notifications for new incoming messages vor 1 Jahr
frontend 49def55c7b add user names for messages vor 1 Jahr
package-lock.json cca472ae25 add media query and some fix vor 1 Jahr
package.json cca472ae25 add media query and some fix vor 1 Jahr