add dockerfile and config

docker/Dockerfile

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+## syntax=docker/dockerfile:3
+
+FROM purplei2p/i2pd
+
+# Copy configs
+COPY ./docker/i2pd.conf /home/i2pd/i2pd.conf
+COPY ./docker/i2pd.tunnels.conf /home/i2pd/data/tunnels.conf
+

docker/i2pd.conf

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+tunconf = /home/i2pd/data/tunnels.conf
+log = stdout
+
+#Uncomment line below to look your placard site XXX.b32.i2p address in `docker-compose logs` at line:
+#"/info - Destination: Local address XXX created"
+#loglevel = info
+loglevel = none
+
+[http]
+enabled = false
+
+[httpproxy]
+enabled = false
+
+[socksproxy]
+enabled = false
+

docker/i2pd.tunnels.conf

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+[hidden-service]
+type = server
+host = nginx
+port = 80
+inbound.length = 3
+outbound.length = 3
+keys = hidden-service.dat
+i2cp.reduceOnIdle = true
+