Need an improvement in documentation, it's not clear how to access `calculate_q()` `get_qvals()` `get_q()` in `pyscal3` version

[abhijeetdhakane]

it's not clear how to access calculate_q() get_qvals() get_q() in pyscal3 version.

a small example could be suffcient.

TIA

[srmnitc]

Thanks for opening the issue! I will add more detailed tutorial.