Update README

README.md

@@ -1,15 +1,17 @@
 <p align="center"><a href="https://martinrenou.github.io/ToonChess/"><img width="300" src="images/logo.png"></a></p>
 <h1 align="center">ToonChess</h1>
-<h2 align="center"> 3D Chess game based on OpenGL and Stockfish </h1>
+<h2 align="center"> 3D Chess game based on OpenGL </h1>
 <h2 align="center"><a href="https://martinrenou.github.io/ToonChess/">Website</a></h1>
 
 [![Build Status](https://travis-ci.org/martinRenou/ToonChess.svg?branch=master)](https://travis-ci.org/martinRenou/ToonChess)
 
 ## Installation (linux only)
 
-Install [CMake](https://cmake.org/), [Stockfish](https://stockfishchess.org/) and [OpenGL](https://www.opengl.org/):
+### Installation of dependencies
+
+Install [CMake](https://cmake.org/) and [OpenGL](https://www.opengl.org/):
 ```bash
-sudo apt-get install cmake stockfish xorg-dev freeglut3-dev
+sudo apt-get install cmake xorg-dev freeglut3-dev
 ```
 
 Install [Bullet Physics](http://bulletphysics.org/wordpress/):
@@ -22,6 +24,26 @@ sudo make install
 cd ..
 ```
 
+If you want to use [Stockfish](https://stockfishchess.org/) as AI (Stockfish will be used by default but any AI using the [UCI protocol](http://wbec-ridderkerk.nl/html/UCIProtocol.html) can work with ToonChess) you can install it using the following:
+```bash
+sudo apt-get install stockfish
+```
+
+### Install of ToonChess
+
+You can install the Python GUI for ToonChess, it provides a nice GUI for changing game parameters like the AI that you want to use, the screen resolution or color of pieces.
+
+But it's not required to install the Python GUI if you do not want to, you would still be able to configure ToonChess as you wish, manually changing the `/home/user/.config/toonchess/config.txt` file.
+
+#### Installation of ToonChess with Python GUI
+
+If you want to, you can install the python GUI for ToonChess, you will need one of the following installed on your computer in order to make it work:
+
+- PyQt
+- wxPython
+- PySide
+- PyQt5
+
 Download source code:
 ```bash
 git clone https://github.com/martinRenou/ToonChess.git
@@ -30,13 +52,36 @@ cd ToonChess
 
 Install ToonChess:
 ```bash
-mkdir build && cd build && cmake ..
+mkdir build && cd build
+cmake ..
+sudo make install
+```
+
+Run it!
+```bash
+toonchess
+```
+
+#### Installation of ToonChess without Python GUI
+
+If you prefer not to install the Python GUI:
+
+Download source code:
+```bash
+git clone https://github.com/martinRenou/ToonChess.git
+cd ToonChess
+```
+
+Install ToonChess without the Python GUI:
+```bash
+mkdir build && cd build
+cmake -DTOONCHESS_BUILD_PYTHON_GUI=OFF ..
 sudo make install
 ```
 
 Run it!
 ```bash
-ToonChess
+toonchess
 ```
 
 ## Tests