Create new tutorial to reading different dataset in the bid format and using the moabb.

[bruAristimunha]

Related with #408

[PierreGtch]

What do you have in mind @bruAristimunha ?

Is this different from this tutorial? https://github.com/NeuroTechX/moabb/blob/2e443f3cff624a2281050994a969de422dfcd16b/examples/plot_bids_conversion.py

[bruAristimunha]

Yes! I was thinking of something like this... given a BID dataset in the "jungle", which is not integrated with moabb... make a tutorial teaching how to convert/epoch them using bids, and integrate bids to moabb format.

[bruAristimunha]

I think it's a complementary tutorial to yours, which can potentially attract more users to the library

[PierreGtch]

oh yes very nice!!! We could create a BaseBidsDataset class so that you only have very little to implement when adding a new BIDS dataset to moabb