Added a Dockerfile to run gitsome in a Docker container

Signed-off-by: Mario Loriedo <mario.loriedo@gmail.com>

Dockerfile

@@ -0,0 +1,26 @@
+##########################################################
+#                                                        #
+#  Build the image:                                      #
+#    docker build -t gitsome .                           #
+#                                                        #
+#  Run the container:                                    #
+#   docker run -ti --rm -v $(pwd):/src/                \ #
+#       -v ${HOME}/.gitsomeconfig:/root/.gitsomeconfig \ #
+#       -v ${HOME}/.gitconfig:/root/.gitconfig         \ #
+#       gitsome                                          #
+#                                                        #
+##########################################################
+FROM python:3.5
+
+RUN pip install Pillow
+
+COPY /requirements-dev.txt /gitsome/
+WORKDIR /gitsome/
+RUN pip install -r requirements-dev.txt
+
+COPY / /gitsome/
+RUN pip install -e .
+
+RUN mkdir /src/
+WORKDIR /src/
+ENTRYPOINT ["gitsome"]

README.md

@@ -121,7 +121,8 @@ For no color, set the value(s) to `None`.  `white` can appear as light gray on s
 
 ## Available Platforms
 
-`gitsome` is available for Mac, Linux, Unix, and [Windows](#windows-support).
+`gitsome` is available for Mac, Linux, Unix, [Windows](#windows-support) and
+[Docker](#running-as-docker-container).
 
 ## TODO
 
@@ -176,6 +177,7 @@ For no color, set the value(s) to `None`.  `white` can appear as light gray on s
 * [Installation](#installation)
     * [Pip Installation](#pip-installation)
     * [Virtual Environment Installation](#virtual-environment-installation)
+    * [Running as Docker container](#running-as-docker-container)
     * [Running the `gh configure` Command](#running-the-gh-configure-command)
         * [For GitHub Enterprise Users](#for-github-enterprise-users)
     * [Enabling Bash Completions](#enabling-bash-completions)
@@ -548,6 +550,34 @@ To deactivate the `gitsome` `virtualenv`, run:
 
     $ deactivate
 
+### Running as Docker Container
+
+You can run gitsome in a Docker container to avoid installing Python and pip locally. To install Docker check out the [official Docker documentation](https://docs.docker.com/engine/getstarted/step_one/#step-1-get-docker).
+
+Once you have docker installed you can run gitsome:
+
+    $ docker run -ti --rm mariolet/gitsome
+
+You can use Docker volumes to let gitsome access your working directory, your local .gitsomeconfig and .gitconfig:
+
+    $ docker run -ti --rm -v $(pwd):/src/              \
+       -v ${HOME}/.gitsomeconfig:/root/.gitsomeconfig  \
+       -v ${HOME}/.gitconfig:/root/.gitconfig          \
+       mariolet/gitsome
+
+If you are running this command often you will probably want to define an alias:
+
+    $ alias gitsome="docker run -ti --rm -v $(pwd):/src/              \
+                      -v ${HOME}/.gitsomeconfig:/root/.gitsomeconfig  \
+                      -v ${HOME}/.gitconfig:/root/.gitconfig          \
+                      mariolet/gitsome"
+
+To build the Docker image from sources:
+
+    $ git clone https://github.com/donnemartin/gitsome.git
+    $ cd gitsome
+    $ docker build -t gitsome .
+
 ### Starting the `gitsome` Shell
 
 Once installed, run the optional `gitsome` autocompleter with interactive help: