docker: add ltcd image

Intoduce the Litecoin network daemon, which will be needed in order
to interact with Litecoin blockchain.

docker/ltcd/Dockerfile

@@ -0,0 +1,45 @@
+FROM golang:1.7
+
+MAINTAINER Andrey Samokhvalov <andrew.shvv@gmail.com>
+
+# Expose mainnet ports (server, rpc)
+EXPOSE 8333 8334
+
+# Expose testnet ports (server, rpc)
+EXPOSE 18333 18334
+
+# Expose simnet ports (server, rpc)
+EXPOSE 18555 18556
+
+# Expose segnet ports (server, rpc)
+EXPOSE 28901 28902
+
+# Grab and install the latest version of roasbeef's fork of btcd and all
+# related dependencies.
+WORKDIR $GOPATH/src/github.com/ltcsuite/ltcd
+RUN git clone https://github.com/ltcsuite/ltcd ./
+RUN go get -u github.com/Masterminds/glide
+RUN glide install
+RUN go install . ./cmd/ltcctl ./cmd/gencerts
+
+RUN mkdir "/rpc" "/root/.ltcd" "/root/.ltcctl"
+RUN touch "/root/.ltcd/ltcd.conf"
+
+# Manually generate certificate and add all domains, it is needed to connect
+# "ltcctl" and "lnd" to "ltcd" over docker links.
+RUN "/go/bin/gencerts" --host="*" --directory="/rpc" --force
+
+# Create a volume to house pregenerated RPC credentials. This will be
+# shared with any lnd, btcctl containers so they can securely query btcd's RPC
+# server.
+# You should NOT do this before certificate generation!
+# Otherwise manually generated certificate will be overriden with shared
+# mounted volume! For more info read dockerfile "VOLUME" documentation.
+VOLUME ["/rpc"]
+
+COPY "start-ltcctl.sh" .
+COPY "start-ltcd.sh" .
+
+RUN chmod +x start-ltcctl.sh
+RUN chmod +x start-ltcd.sh
+