Add TypeScript type definitions.

[dkushner]

Went looking to use found-relay with a TypeScript/React project and was unable to do so as all of the examples depend on farce and its history management, which does not have TypeScript type definitions available (that I could find).

[taion]

I'd be happy to take a PR adding them.

Though note that you're not going to be directly dealing with the Farce API much in using Found.

[dkushner]

@taion: Yeah, I'd noticed as much from the documentation, which is why it was a bit frustrating. Really small piece of the puzzle but lack of types stopped me. I'll see if I can at least get a decent start point out of dts-gen and go from there.

[taion]

Why do the types or lack thereof matter if you're not directly interacting with the library?

[dkushner]

@taion Per the example project for found-relay, I need to be able to instantiate the history protocol instance and import several other components.

import HashProtocol from 'farce/lib/HashProtocol';
import queryMiddleware from 'farce/lib/queryMiddleware';

This causes TypeScript to complain, obviously, because it can't find type definitions for these imports.