Add Allenxuxu/gev (#2741)

* Add Allenxuxu/gev

gev is a lightweight, fast non-blocking TCP network library based on Reactor mode.

* Update README.md

README.md

@@ -1213,6 +1213,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [fasthttp](https://github.com/valyala/fasthttp) - Package fasthttp is a fast HTTP implementation for Go, up to 10 times faster than net/http.
 * [fortio](https://github.com/fortio/fortio) - Load testing library and command line tool, advanced echo server and web UI. Allows to specify a set query-per-second load and record latency histograms and other useful stats and graph them. Tcp, Http, gRPC.
 * [ftp](https://github.com/jlaffaye/ftp) - Package ftp implements a FTP client as described in [RFC 959](http://tools.ietf.org/html/rfc959).
+* [gev](https://github.com/Allenxuxu/gev) - gev is a lightweight, fast non-blocking TCP network library based on Reactor mode.
 * [gmqtt](https://github.com/DrmagicE/gmqtt) - Gmqtt is a flexible, high-performance MQTT broker library that fully implements the MQTT protocol V3.1.1.
 * [gnet](https://github.com/panjf2000/gnet) - `gnet` is a high-performance, lightweight, nonblocking, event-loop networking library written in pure Go.
 * [gNxI](https://github.com/google/gnxi) - A collection of tools for Network Management that use the gNMI and gNOI protocols.