Add examples to the user guide

Author: theacodes

examples/noise.py

@@ -1,4 +1,4 @@
-# This advanced sample is similar to the sine example, except
+# This advanced example is similar to the sine example, except
 # it generates white noise.
 
 import array

examples/sine.py

@@ -1,4 +1,4 @@
-# This advanced sample shows how to create a custom waveform
+# This advanced example shows how to create a custom waveform
 # for the button to output. In this case, it generates a
 # sine wave. You can use this example as a basis for very
 # basic oscillators.

user_guide/docs/index.md

@@ -100,9 +100,13 @@ If you want to you can learn more about [CircuitPython](https://learn.adafruit.c
 
 ## Examples
 
-Big Honking Button can do all sorts of things! We've made a few examples to get you started:
-
+Big Honking Button can do all sorts of things! We've made a few examples to get you started. If you want to use these, copy their contents to `code.py` on the `CIRCUITPY` drive. **Be sure to save it as the correct name,** if you don't name it `code.py` it won't change anything. If you want to restore the original `code.py` it is [here](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/default.py).
 
+1. [Cycle example](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/cycle.py): Shows how to load multiple samples and cycle between them.
+1. [Random example](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/default.py): Shows how to load multiple samples and choose one at random.
+1. [Tap tempo example](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/tap_tempo.py): Shows how to use the button to set the tempo and have the module play back a sample at each beat.
+1. [Sine example](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/sine.py): An advanced example that shows how to generate a custom waveform.
+1. [Noise example](https://github.com/theacodes/Winterbloom-Big-Honking-Button/blob/master/examples/noise.py): An advanced example that shows how to generate noise.
 
 
 ## Help! I change some code and this thing isn't working!