Updated all files with JsDocs

[caelinsutch]

For #8

Still not done as of time of writing, just giving everyone a headsup that I'm working on this

[caelinsutch]

@SwapnikKatkoori I left some comments where I'm not sure what the correct type is, or how the function works. If you could give me some guidance that'd be great! Once this is done I can make the Typescript typings