add gui example

Author: mgckind

gui_examples/Dockerfile

@@ -0,0 +1,16 @@
+FROM ubuntu:14.04
+
+RUN apt-get update && apt-get install -y firefox
+
+# Replace 1000 with your user / group id
+RUN export uid=1000 gid=1000 && \
+    mkdir -p /home/developer && \
+    echo "developer:x:${uid}:${gid}:Developer,,,:/home/developer:/bin/bash" >> /etc/passwd && \
+    echo "developer:x:${uid}:" >> /etc/group && \
+    echo "developer ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/developer && \
+    chmod 0440 /etc/sudoers.d/developer && \
+    chown ${uid}:${gid} -R /home/developer
+
+USER developer
+ENV HOME /home/developer
+CMD /usr/bin/firefox

gui_examples/Readme

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+sudo docker build -t firefox .
+sudo xhost +
+sudo docker run -it --rm -e DISPLAY=$DISPLAY -e XAUTHORITY=$XAUTHORITY -v /tmp/.X11-unix:/tmp/.X11-unix firefox