add documentation

docker/tor/Dockerfile

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+FROM alpine:edge
+
+RUN apk add --no-cache curl tor 
+
+EXPOSE 9050
+
+HEALTHCHECK --interval=60s --timeout=15s --start-period=20s \
+    CMD curl -x socks5h://127.0.0.1:9050 'https://check.torproject.org/api/ip' | grep -qm1 -E '"IsTor"\s*:\s*true'
+
+
+# default owner is tor, but running as root to avoid docker volume mount issue
+RUN chown -R root:root /var/lib/tor
+
+VOLUME ["/var/lib/tor/4get"]
+
+COPY ./torrc /etc/tor/torrc
+
+ENTRYPOINT ["/usr/bin/tor"]

docker/tor/torrc

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+SocksPort 0.0.0.0:9050