Added shadowsocks-libev docker image

This image based debian:stretch

Signed-off-by: Teddysun <i@teddysun.com>

docker/shadowsocks-libev/Dockerfile

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+# Dockerfile for shadowsocks-libev
+# Copyright (C) 2018 Teddysun <i@teddysun.com>
+# Reference URL:
+# https://github.com/shadowsocks/shadowsocks-libev
+
+FROM debian:stretch
+MAINTAINER Teddysun <i@teddysun.com>
+
+RUN set -ex; \
+    printf "deb http://deb.debian.org/debian stretch-backports main" > /etc/apt/sources.list.d/stretch-backports.list; \
+    apt-get update; \
+    apt-get -t stretch-backports install -y shadowsocks-libev; \
+    rm -rf /var/lib/apt/lists/*;
+
+VOLUME /etc/shadowsocks-libev
+
+USER nobody
+
+CMD [ "/bin/bash", "-c", "/usr/bin/ss-server -c /etc/shadowsocks-libev/config.json" ]

docker/shadowsocks-libev/README.md

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+## Shadowsocks-libev Docker Image by Teddysun
+
+[shadowsocks-libev][1] is a lightweight secured socks5 proxy for embedded devices and low end boxes.  It is a port of [shadowsocks][2] created by @clowwindy maintained by @madeye and @linusyang.
+
+Docker images are built for quick deployment in various computing cloud providers. For more information on docker and containerization technologies, refer to [official document][3].
+
+## Prepare the host
+
+If you need to install docker by yourself, follow the [official installation guide][4].
+
+## Pull the image
+
+```bash
+$ docker pull teddysun/shadowsocks-libev
+```
+This pulls the latest release of shadowsocks-libev.
+It can be found at [Docker Hub][5].
+
+## Start a container
+
+You **must create a configuration file**  `/etc/shadowsocks-libev/config.json` in host at first, and sample:
+```
+{
+    "server":"0.0.0.0",
+    "server_port":9000,
+    "password":"password0",
+    "timeout":300,
+    "method":"aes-256-gcm",
+    "fast_open":true,
+    "nameserver":"8.8.8.8",
+    "mode":"tcp_and_udp"
+}
+```
+This container with sample configuration `/etc/shadowsocks-libev/config.json`
+There is an example to start a container that listens on `9000` (both TCP and UDP):
+```bash
+$ docker run -d -p 9000:9000 -p 9000:9000/udp --name ss-libev -v /etc/shadowsocks-libev:/etc/shadowsocks-libev teddysun/shadowsocks-libev
+```
+
+**Note**: The port number must be same as configuration.
+
+[1]: https://github.com/shadowsocks/shadowsocks-libev
+[2]: https://shadowsocks.org/en/index.html
+[3]: https://docs.docker.com/
+[4]: https://docs.docker.com/install/
+[5]: https://hub.docker.com/r/teddysun/shadowsocks-libev/

docker/shadowsocks-libev/config_sample.json

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+{
+    "server":"0.0.0.0",
+    "server_port":9000,
+    "password":"password0",
+    "timeout":300,
+    "method":"aes-256-gcm",
+    "fast_open":true,
+    "nameserver":"8.8.8.8",
+    "mode":"tcp_and_udp"
+}