Initial project import

tools/v/vlib/net/README.md

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+## Description
+
+`net` provides networking functions. It is mostly a wrapper to BSD sockets,
+so you can listen on a port, connect to remote TCP/UDP services, and
+communicate with them.
+
+UDP multicast example:
+
+```v
+import net
+
+mut socket := net.listen_udp('0.0.0.0:9999')!
+socket.join_multicast_group('224.0.0.1', '0.0.0.0')!
+socket.set_multicast_ttl(2)!
+socket.set_multicast_loop(true)!
+```