Added 3 sub projects: crtpi, irq01, uart02
The crtpi is a basic all in application folder that can be used to create a full
blown application that can access everything I've got working so far, every test
application will donate code to this project.
irq01 - Taking what I've got in uart02 added the facility to react on an
  interrupt for the inbound data.
uart02 - A very basic echo server, any bytes past in on the MU gets sent back.