Update README.md

Author: bluenet13

README.md

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 ANS(accelerated network stack) is DPDK native TCP/IP stack and also refer to [FreeBSD](http://freebsd.org) implementation. ANS provides a userspace TCP/IP stack for use with the Intel [DPDK](http://dpdk.org/). 
 
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+![](/doc/design/ans_code.png)
 - ans: accelerated network stack process.
 
 - librte_ans: TCP/IP stack static library. ANS use dpdk mbuf, ring, memzone, mempool, timer, spinlock. so zero copy mbuf between dpdk and ANS.