Create a simple usable example

[torch2424]

Creating a PPM Decoder would be small, and show off a good use case of the framebuffer (outside of gaming!).

• https://stackoverflow.com/questions/16636311/what-is-the-simplest-rgb-image-format
• http://rosettacode.org/wiki/Bitmap/Write_a_PPM_file#C
• https://www.online-utility.org/image/convert/to/PPM