create a Dockerfile for ssr (#143)

by this dockerfile, make it easy to run ssr-server on docker server

Dockerfile

@@ -0,0 +1,32 @@
+FROM alpine
+
+ENV SERVER_ADDR 0.0.0.0
+ENV SERVER_PORT 51348
+ENV PASSWORD=
+ENV METHOD      aes-256-cfb
+ENV PROTOCOL    origin
+ENV OBFS      http_simple
+ENV TIMEOUT     300
+ENV DNS_ADDR    8.8.8.8
+ENV DNS_ADDR_2  8.8.4.4
+
+
+RUN apk update \
+    && apk add python \
+    libsodium \
+    unzip \
+    wget \
+  && rm -rf /var/cache/apk/*
+
+
+
+RUN wget --no-check-certificate https://github.com/breakwa11/shadowsocks/archive/manyuser.zip -O /tmp/manyuser.zip \
+    && unzip -d /tmp /tmp/manyuser.zip \
+    && mv /tmp/shadowsocks-manyuser/shadowsocks ~/shadowsocks \
+    && rm -rf /tmp/*
+
+
+WORKDIR ~/shadowsocks
+
+
+CMD python ~/shadowsocks/server.py -p $SERVER_PORT -k $PASSWORD -m $METHOD  -O $PROTOCOL -o $OBFS