chore: add Dockerfile for keygen & signing example codes

Dockerfile

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+FROM rustlang/rust:nightly as build
+WORKDIR multi-party-ecdsa
+COPY ./ ./
+RUN cargo build --release --examples
+
+FROM ubuntu:18.04
+WORKDIR multi-party-ecdsa
+COPY --from=build /multi-party-ecdsa/target/release/examples/sm_manager .
+COPY --from=build /multi-party-ecdsa/target/release/examples/gg18_keygen_client .
+COPY --from=build /multi-party-ecdsa/target/release/examples/gg18_sign_client .
+
+EXPOSE 8001

demo/docker_demo.sh

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+#!/usr/bin/env bash
+
+# build dokcer image if not built before
+# docker build . -t=multi-party-ecdsa
+
+mkdir -p ~/KZen-networks/multi-party-ecdsa/temp/
+sudo cp Rocket.toml ~/KZen-networks/multi-party-ecdsa/temp/
+sudo cp params ~/KZen-networks/multi-party-ecdsa/temp/
+sudo cp demo/run_in_docker.sh ~/KZen-networks/multi-party-ecdsa/temp/
+
+docker-compose up

demo/run_in_docker.sh

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+#!/usr/bin/env bash
+
+n=`cat params | sed -n 1p`
+t=`cat params | sed -n 2p`
+params="{\"parties\":\"$n\", \"threshold\":\"$t\"}"
+
+echo "Params: $params"
+echo -n $params > params.json
+echo "$0: Multi-party ECDSA parties:$n threshold:$t"
+sleep 1
+
+./sm_manager &
+
+sleep 2
+echo "keygen part"
+
+for i in $(seq 1 $n)
+do
+    echo "key gen for client $i out of $n"
+    ./gg18_keygen_client http://0.0.0.0:8001 keys$i.store &
+    sleep 3
+done
+
+
+
+sleep 5
+echo "sign"
+
+for i in $(seq 1 $((t+1)));
+do
+    echo "signing for client $i out of $((t+1))"
+    ./gg18_sign_client http://0.0.0.0:8001 keys$i.store "KZen Networks" &
+    sleep 3
+done

docker-compose.yml

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+version: '3'
+
+services:
+  multi-party-ecdsa:
+    image: multi-party-ecdsa
+    container_name: multi-party-ecdsa
+    command: bash -c "cp /multi-party-ecdsa/temp/Rocket.toml . &&
+                      cp /multi-party-ecdsa/temp/params . &&
+                      cp /multi-party-ecdsa/temp/run_in_docker.sh . &&
+                      ./run_in_docker.sh"
+    volumes:
+      - ~/KZen-networks/multi-party-ecdsa/temp/:/multi-party-ecdsa/temp/