Add README to repo.

Author: tylercrumpton

README.md

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+SNAPpy Includes for the Pyduino Development Board
+===================================
+
+Introduction
+------------
+
+`pyduino-includes` is a SNAPpy library that is designed to make development for the Synapse Pyduino board easier. It
+allows references to the nifty Pyduino IO names (like D3, AD0, or SCL) instead of the underlying SNAPpy GPIO numbers.
+
+Installation
+------------
+
+The easiest way to install `pyduino-includes` is using 
+[pip](https://pip.pypa.io/en/latest/installing.html):
+
+    pip install git+ssh://[email protected]/tyler.crumpton/pyduino-includes.git@master
+
+Alternatively you can download the source, extract it, and install it:
+
+    python setup.py install
+    
+(Eventually the package will be pushed to our pip repo, and won't require GitLab access.)
+
+Usage
+-------------
+
+In order to use the nice IO names, simply import `pyduino-includes` in your SNAPpy script like this:
+
+```python
+from PyduinoIncludes import *
+    
+def drive_d4_pin_high():
+    setPinDir(D4 ,True)
+    writePin(D4 ,True)
+```
+
+Pins can be referenced as follows:
+
+| Pin Type | Pyduino IO Name |
+|----------|-----------------|
+| Digital  | D0 - D13        |
+| Analog   | A0 - A5         |
+| i2c      | SDA, SCL        |
+