Add GOESTools

I received a request to add GOES Tools from Christopher Adden:

GitHub repository: https://github.com/pietern/goestools.git

Description:

Tools to work with signals and files from GOES satellites.

goesrecv: Demodulate and decode signal into packet stream. goeslrit: Assemble LRIT files from packet stream. goesproc: Process LRIT files into plain files and images. I started writing this to learn about things involved in the GOES communication pipeline and in the process learn more about space communication standards. Everything is written in C++ to strike a balance between usability (no need for yet another hash table in C) and performance. Eventually it would be nice to run the entire RX pipeline on a little ARM board. The entire RX pipeline can run on a Raspberry Pi 3.