Upgrade Network Server to Handle Multi-Threading

[energystorm51]

The server needs to efficiently manage multiple simultaneous connections. Here is a reference to non-blocking reads: https://medium.com/coderscorner/tale-of-client-server-and-socket-a6ef54a74763

Acceptance criteria:

1. The program should create a new thread for each incoming connection to handle client communication.
2. This approach has to allow multiple clients to connect simultaneously.
3. In each thread, implement non-blocking reads from the sockets to efficiently receive and store data in one shared data structure - a list.