Add different tablature sources

[ThiagoAugustoSM]

Enhancement

Today the only source for the tablatures is the Cifra Club's website. Other sources of tablature would be good.

Tips

The file index.js contain the request for the tablatures from the cifraclub's website. Making changes on that would be a good option.

[giancarloGiuffra]

Hi, I would love to work on this. I have an arduino too. Don't use it that much but I sure want to play my favorite song in it :)

[ThiagoAugustoSM]

Okay, @giancarloGiuffra ! Give it a try :)