Added a 'Installation' section to the docs

docs/intro.rst

@@ -10,6 +10,41 @@ The name `Pingo`_ is a tribute to `Garoa Hacker Clube`_, where the project start
 .. _Pingo: https://garoa.net.br/wiki/Pingo
 .. _Garoa Hacker Clube: https://garoa.net.br/wiki/Garoa_Hacker_Clube:About
 
+------------
+Installation
+------------
+
+Basicly, there are two ways of installing Pingo:
+
+1. from Python Pip
+2. from Github (recommended)
+
+Installing Pingo from Pip installer
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To install Pingo from Pip installer, first, make sure you have pip installed in your machine. On Linux machines, this usually means you have the `python-pip` package installed. You can check if you have pip in your machine by typing the following text on a shell prompt:
+
+>>> $ pip --version
+pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7) 
+>>>
+
+If the output is similar from the one above, you can install Pingo by simple typing `pip install pingo` as root on you terminal. That's it!
+
+Installing Pingo from Github
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Since Pingo is actually in alpha state and under heavy develpment right now, installing Pingo from Github can be a good idea. Besides that, it will be easy for you to collaborate with the project, if you wish. See the Contributing section on the left menu.
+
+To install Pingo from Github, you must have Git installed. Presuming you already have that, just type:
+
+`git clone https://github.com/garoa/pingo.git`
+
+After that, get into the pingo directory and setup Python to use your brand new directory as a library:
+
+`python setup.py install`
+
+Done! You are ready to program using Pingo!
+
 -----------
 Basic usage
 -----------