User Guide Notebook for Azimuthal Mean

[philipc2]

If the preference is to add that later, could you please create an issue regarding that, if none exists. Also, who is going to write that guide, @jpan84 maybe you?

Originally posted by @erogluorhan in #1255 (review)

[erogluorhan]

Hi @jpan84 , if you'd like to self-assign and work on this, feel free to do so. It'd be great to see an user guide that demonstrates your use cases!

[jpan84]

Ok, I've self-assigned and definitely have some use cases I can show from my research when I get around to it