Show old messages when opening the app

[flplima]

What would you like to be added:
All messages sent and received are saved in the MongoDB database, however, they are currently not displayed when the app opens.

Why is this needed:
We need that when the app opens, send an event to the server (through socket.io), and the server responds with the old messages saved in the database. Then the React app can render them on the screen, just like any messaging app.

Is your enhancement request related to a problem? Please describe.
It is frustrating when you send many messages and restart the app and see that they are not there, even being saved in the database.

It would be even better if the server returned a limited number of messages (for example, 20), and loaded more as the user scrolled through the app. That is, an infinite loading. But that could be an improvement for an upcoming release.

[geekyayush]

Dude, this project is 🔥.
Would love to contribute to this project and see it grow 🚀.