[Linux c] Add tcp
study basic linux tcp
[Linux c] Add tcp into libnet.a
    Add tcp init function into libnet.a
    Add tcp_server_loop function
    Add tcp_client_loop function
    Add select method to tcp_server_loop
    Create directories for project and Update Makefile
    Add close handle function in server
    Add cmd parser in server and client
Merge branch 'feature-common' into develop

Conflicts:
	Makefile