add to `cdnjs`

[maruilian11]

hi, recently we want to add your lib to https://cdnjs.com, could you please set a version number for current files, it's good for us update your lib on cdnjs after you update your lib. Or if you are not going to update this lib, can we regard it as v1.0.0?
thank you very much!

btw, does files under img also need to be host? I saw digits.png is mentioned in js file.

cdnjs/cdnjs#8783