Better documentation on how to create an image based meta-analysis dataset from scratch

[jdkent]

Summary

Cover the use case of an individual with a bunch of statistical images on their filesystem that they want to organize into a dataset.

Additional details

They would be able to create a dataset and use NiMARE

Next steps

• add documentation

[tsalo]

TBH I wouldn't even know where to start with creating an image-based dataset from scratch, outside of using Neurostore eventually or writing the JSON file from scratch. What do you envision the process being like? Do we need a new non-NIMADS format that we can convert from, like how we handle Sleuth and Neurosynth/NeuroQuery files?