Like whatsup web

online messaging system. Postgress sql should be used as database. Backhand should be written with .net core 5. front end must be at least angular 10. singular should be used. For messages sent to the ofline user, it should be kept on the rappit mq and the relevant person should be able to see the messages when online A simple messaging system. one-to-one messages should be sent, and pictures and audio files should not be sent. message can be shared. it should be like whatsapp web app as full example. All conversations sent documents should be recorded in the database.