Merge pull request #136 from yvan-sraka/patch-2

Update Appendix 1 with Raspberry Pi setup instructions

appendix/01/README.md

@@ -4,9 +4,9 @@ A few years ago, assuming that everybody has a computer with a graphical process
 
 Thanks to the [Raspberry Pi Foundation](http://www.raspberrypi.org/) a new type of small and cheap generation of computers (around $35 each) has found its way into classrooms. More importantly for the purposes of this book, the [Raspberry Pi](http://www.raspberrypi.org/) comes with a decent Broadcom GPU that can be accessed directly from the console. I made a [flexible GLSL live coding tool call **glslViewer**](https://github.com/patriciogonzalezvivo/glslViewer) that runs all the examples in this book. This program also has the ability to update automatically when the user saves a change to their code. What does this mean? You can edit the shader and every time you save it, the shader will be re-compile and render for you.
 
-By making a local copy of the repository of this book (see the above section) and having [```glslViewer``` installed](https://github.com/patriciogonzalezvivo/glslViewer), users can run the examples with ```glslviewer```. Also by using the ```-l``` flag they can render the example in a corner of the screen while they modify it with any text editor (like ```nano```, ```pico```, ```vi```, ```vim``` or ```emacs```). This also works if the user is connected through ssh/sftp.
+By making a local copy of the repository of this book (see the above section) and having [`glslViewer` installed](https://github.com/patriciogonzalezvivo/glslViewer), users can run the examples with `glslviewer`. Also by using the `-l` flag they can render the example in a corner of the screen while they modify it with any text editor (like `nano`, `pico`, `vi`, `vim` or `emacs`). This also works if the user is connected through ssh/sftp.
 
-To install and set this all up on the Raspberry Pi after installing the OS and logging in, type the following commands:
+To install and set this all up on the Raspberry Pi after installing [Raspbian](https://www.raspberrypi.org/downloads/raspbian/), a Debian-based Linux distribution made for Raspberry Pi, and logging in, type the following commands:
 
 ```bash
 sudo apt-get update
@@ -15,4 +15,4 @@ sudo apt-get install git-core glslviewer
 cd ~
 git clone https://github.com/patriciogonzalezvivo/thebookofshaders.git
 cd thebookofshaders
-```
+```