(Documentation) Add details in huggingface repo for further development of LANs

[jainraj]

Is your feature request related to a problem? Please describe.
While the LANs have been open-sourced in huggingface, adding some details could help with ease of use and further development.

Describe the solution you'd like
The following details could be added for each model:

1. Ordered parameter list and the corresponding ranges for which the model was trained
2. Sequential sampling equations and a small schematic (like Fig 3 in Fengler et al., 2021)
3. For MLPs:
   1. Choice encoding scheme
   2. Range of RT used to train the model (I am assuming 0-10 seconds)

[AlexanderFengler]

Thanks for raising this issue @jainraj, we will make that happen asap.