[Improvement] Typescript definition types + NPM

[kefniark]

Description

Few ideas for improvement:

1/ This could be nice to add typescript typings to the repo.
This would make autocompletion and typescript usage of these runtimes more user friendly.

2/ Publishing these runtimes on NPM could helps.
It would be easier to manage as a user, and get future update without have to manually check this repository.

3/ A LICENSE.md file: It took me times to realize the license was directly embedded in each js file. Github doc

[kestrelm]

Very good suggestions! I will look into this when I get the cycles.

Cheers

[bkostrowiecki]

Hello, I created the typings for using this library with Phaser3.
https://github.com/bkostrowiecki/creature_phaser3_typings

So it may be a good starting point for creating TypeScript declarations.