start on c plus docs

escapecplusplus.md

@@ -3,7 +3,41 @@
 ## C++
 
 ### Introduction
-### Install prerequisites
+
+The C++ libraries for the ESCAPE board and some example scripts are available via our GitHub repository. To install them open a terminal window on your Raspberry Pi (unless you are running with only the command line) and enter the following:
+
+``` bash
+$ git clone https://github.com/darkwaterfoundation/darkwater_cplus_escape.git
+```
+
+Once they are download we can navigate into the new directory and take a look around - so enter:
+
+``` bash
+$ cd ./darkwater_cplus_escape
+```
+
+Let's list the contents of that new directory by typing
+
+``` bash
+$ ls -al
+```
+
+You should see two directories (and a README.md file which contains this content), called **darkwater** and **examples**. 
+
+The **darkwater** directory contains all of the classes needed to control your board and the **examples** directory contains a selection of demo code we've put together to show you how they are used.
+
+#### Examples
+
+Take a look in the examples directory and you will see the following available demos.
+
+##### Motor
+
+##### Servo
+
+##### PPM
+
+##### AccelGyroMag
+
 ### Drive a motor
 ### Motor speed
 ### Servo control