Merge pull request xingshaocheng#29 from zucig/patch-1

Add web cache

README.md

@@ -1182,6 +1182,13 @@ APM —  Application Performance Management
 * [《H5 和移动端 WebView 缓存机制解析与实战》](https://mp.weixin.qq.com/s/qHm_dJBhVbv0pJs8Crp77w)
 
 ## 服务端缓存
+
+### Web缓存
+
+* [nuster](https://github.com/jiangwenyuan/nuster) - nuster cache
+* [varnish](https://github.com/varnishcache/varnish-cache) - varnish cache
+* [squid](https://github.com/squid-cache/squid) - squid cache
+
 ### Memcached
 * [《Memcached 教程》](http://www.runoob.com/Memcached/Memcached-tutorial.html)
 * [《深入理解Memcached原理》](https://blog.csdn.net/chenleixing/article/details/47035453)