A bench mark test for udp reliable protocal framework.

The bench mark is for realtime pvp game. For example, the multiplayer first person shooting game.
The requirement of realtime pvp game is packet is small and frequently.
It wants a minimal delay. And the worst delay should be not so worse.
The test client send 500 bytes in every 50 milliseconds. And the server send it back after receiving immediately.

Three frameworks were tested,

• UDT - UDP-based Data Transfer Protocol
• kcp - A Fast and Reliable ARQ Protocol
• enet - Reliable UDP networking library

You can see the whole bench mark test result in bench_mark.md.