Add Dockerfile for automatical build on the Docker hub

Dockerfile

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+#
+# Glances Dockerfile
+#
+# https://github.com/nicolargo/glances
+#
+
+# Pull base image.
+FROM ubuntu
+
+# Install Glances (develop branch)
+RUN apt-get -y install curl && \
+    curl -L https://raw.githubusercontent.com/nicolargo/glancesautoinstall/master/install-develop.sh | /bin/bash
+
+# Define working directory.
+WORKDIR /glances
+
+# Define default command.
+CMD ["python", "-m", "glances", "$GLANCES_OPT"]