Added dockerfile

- dockerfile builds the echo example
- example commands to run the container are in the dockerfile

Dockerfile

@@ -0,0 +1,53 @@
+
+# BUILD:
+#   docker build -t grpc-web .
+#
+# RUN:
+#   start the container:
+#      docker run -itdp 8080:8080 -p 9091:9091 --name grpc-web grpc-web /bin/bash
+#
+#   start nginx:
+#      docker exec -itp 8080:8080 -p 9091:9091 grpc-web /grpc-web/gConnector/nginx.sh
+#
+#   start the grpc server:
+#      docker exec -it grpc-web /grpc-web/net/grpc/gateway/examples/echo/echo_server
+FROM ubuntu:latest as install
+
+COPY ./ /grpc-web
+
+RUN apt-get update && apt-get install -y \
+  autoconf \
+  automake \
+  build-essential \
+  curl \
+  git \
+  default-jdk \
+  default-jre \
+  libtool \
+  libpcre3 \
+  libpcre3-dev \
+  libssl-dev \
+  make \
+  python-software-properties \
+  software-properties-common \
+  zip
+
+# Stage 2 init git submodules
+RUN cd /grpc-web && \
+  ./init_submodules.sh
+
+# Stage 3 build the libraries
+RUN cd /grpc-web/third_party/grpc/third_party/protobuf && \
+  ./autogen.sh && ./configure && make && make install
+
+RUN cd /grpc-web/third_party/grpc && \
+  ldconfig && \
+  EMBED_OPENSSL=false make && \
+  EMBED_OPENSSL=false make install
+
+# Stage 4: closure compiler and build example
+RUN cd /grpc-web && \
+  curl http://dl.google.com/closure-compiler/compiler-latest.zip -o compiler-latest.zip && \
+  unzip -p -qq -o compiler-latest.zip *.jar > closure-compiler.jar && \
+  make example && \
+  make install-example