Add Dockerfile for development

Dockerfile

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+# Dockerfile for GNS3 server development
+
+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Set the locale
+RUN locale-gen en_US.UTF-8  
+ENV LANG en_US.UTF-8  
+ENV LANGUAGE en_US:en  
+ENV LC_ALL en_US.UTF-8 
+
+RUN apt-get update && apt-get install -y software-properties-common
+RUN add-apt-repository ppa:gns3/ppa
+RUN apt-get update && apt-get install -y \
+    python3-pip \
+    python3-dev \ 
+    qemu-system-x86 \
+    qemu-system-arm \
+    qemu-kvm \
+    libvirt-bin \
+    x11vnc 
+
+# Install uninstall to install dependencies
+RUN apt-get install -y vpcs ubridge
+
+ADD . /server
+WORKDIR /server
+
+RUN pip3 install -r /server/requirements.txt
+
+EXPOSE 3080
+
+ENTRYPOINT python3 -m gns3server --local