Add support for typescript

[jonatanlins]

Hi, I noticed that in .tsx files, images work nice when imported using the require syntax, but when you try to use the import syntax, an TypeScript error occurs.

// it works
const myImage = require("./image.png")

// it fails
import myImage from "./image.png"

This can be easily fixed by adding an index.d.ts file with some type definitions to the root folder.

I'm working on this just now :)

[jonatanlins]

I just realized that this problem has been fixed in canary version, sorry for the inconvenience.