Created KCP Benchmark (markdown)

KCP-Benchmark.md

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+如果网络从来不丢包，那么你直接用 TCP就行了，甚至直接裸UDP都没关系，但是网络因为丢包造成卡顿，特别是高峰时期丢包会上到10%的情况，移动设备上这个情况更糟糕。
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+我自己评测过很多，[asio_kcp](https://github.com/libinzhangyuan/asio_kcp) 的作者做过比较详细的评测，在网络变糟糕的情况下，KCP的延迟比 libenet低三倍以上：
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+`worst network lag happen:`
+`asio: 10:51.21`
+`291  295   269   268   231   195   249   230   225   204`
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+`enet: 10:51.21`
+`1563   1520    1470    1482    1438    1454    1412    1637    1588    1540`
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+更详细的评测可以看这里：[benchmark](https://github.com/libinzhangyuan/reliable_udp_bench_mark/blob/master/bench_mark.md)，感谢 asio_kcp 的作者 zhangyuan 详细对比了 UDT, libenet和 kcp，并给出结论如下：
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+* The kcp is the first choice for realtime pvp game. 
+* The lag is less than 1 second when network lag happen. 3 times better than enet when lag happen. 
+* The enet is a good choice if your game allow 2 second lag. 
+* UDT is a bad idea. It always sink into badly situation of more than serval seconds lag. And the recovery is not expected.
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+其他可以左右你选择的情况：
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+* enet has the problem of lack of doc. And it has lots of functions that you may intrest.
+* kcp's doc is chinese.
+* Good thing is the function detail which is writen in code is english. And you can use asio_kcp which is a good wrap.
+* The kcp is a simple thing. You will write more code if you want more feature.
+* UDT has a perfect doc. UDT may has more bug than others as I feeling.
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