Add Dockerfile for a customized Swift gRPC image.

Docker/Dockerfile

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+FROM swiftdocker/swift:latest
+MAINTAINER Tim Burks <timburks@google.com>
+
+# Install a few needed packages that aren't in swiftdocker/swift
+RUN apt-get -q update && \
+    apt-get -q install -y libz-dev && \
+    apt-get -q install -y unzip 
+
+# Install protoc
+RUN curl -O -L https://github.com/google/protobuf/releases/download/v3.2.0rc2/protoc-3.2.0rc2-linux-x86_64.zip && \
+    unzip protoc-3.2.0rc2-linux-x86_64.zip -d /usr
+
+# Build and install the swiftgrpc plugin
+RUN git clone https://github.com/grpc/grpc-swift && \
+    cd grpc-swift/Plugin && \
+    make && \
+    cp protoc-gen-swift /usr/bin && \
+    cp protoc-gen-swiftgrpc /usr/bin 
+

Docker/README.md

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+# Swift gRPC Base Image
+
+Use the Dockerfile in this directory to build a Docker image 
+that's preloaded with the Swift gRPC plugin and related tools.
+
+Build with the following command:
+
+    docker build -t grpc/swift .
+
+The following commands push the image to Google Container Registry.
+
+    docker tag grpc/swift gcr.io/swift-services/grpc
+    gcloud docker -- push gcr.io/swift-services/grpc
+
+