Adding More Datasets and More How to Access

Hi! Not sure how active this project is, but here goes nothing

I have a dataset that I think it would be a nice addition, especially when dealing with multiple datasets that one would have to merge and clear around, predictably, a Pokemon dataset and a Chess play dataset.

I also wanted to ask if its ok to add the missing How to Access sections, for example adding the ones in Julia, Perl, Typescript/Javascript, Matlab and Octave.