Establish glycogen assay

[AHuffmyer]

Talk with Louis at USDA about incorporating their protocols for glycogen Promega assay

[AHuffmyer]

https://github.com/RobertsLab/resources/blob/master/protocols/Commercial_Protocols/Promega_Glycogen_Glo_Assay.pdf

[kubu4]

I've established a protocol in the handbook:

https://robertslab.github.io/resources/protocols/protocol-glycogen-glo-assay/

It's pretty fleshed out, but will continue to revamp as Hazel performs more rounds of the assay.