Added dpg11 pulser example notebook, which provided an outline for working with the dpg11 and an example for running the dpg11 code. I will update this in the future to include pulsed odmr, and also to go into more depth about using the dpg11, and how it may differ from the other pulsers.

Fixes Add DPG11 Pulser and Example Notebook #138

Author: ethan-r-hansen