Typescript Type Declarations

[Diego Benitez]

Would it be possible to add type declarations for Typescript compatibility?

Something like this: https://www.typescriptlang.org/docs/handbook/declaration-files/templates/module-class-d-ts.html

Would be happy to help with a PR if you can help review.

[Rotem Dan]

Fixed in #17 (with some possible unresolvable type issues in the generated declaration file - looking into it)