Add package.json

[maruilian11]

Hi, I'm from cdnjs. Recently, we want to add your popular lib to https://cdnjs.com. Could you please add a package.json for your lib? We want to ensure all informations are official, especially the version number. Thank you a lot.

If there is no response in a week, we may add your lib first as v1.0.0, thank you.
cdnjs/cdnjs#9555

[maruilian11]

If you don't have time, I'm willing to send a PR for it. 😃