Add typescript definition file

Fixes #134

index.d.ts

@@ -0,0 +1,44 @@
+import * as React from 'react';
+
+export interface ReactPlayerProps {
+  url?: string;
+  playing?: boolean;
+  loop?: boolean;
+  controls?: boolean;
+  volume?: number;
+  playbackRate?: number;
+  width?: string|number;
+  height?: string|number;
+  hidden?: boolean;
+  className?: string;
+  style?: Object;
+  progressFrequency?: number;
+  soundcloudConfig?: {
+    clientId: string,
+    showArtwork: boolean
+  };
+  youtubeConfig?: {
+    playerVars: Object,
+    preload: boolean
+  };
+  vimeoConfig?: {
+    iframeParams: Object,
+    preload: boolean
+  };
+  fileConfig?: {
+    attributes: Object
+  };
+  onReady?(): void;
+  onStart?(): void;
+  onPlay?(): void;
+  onPause?(): void;
+  onBuffer?(): void;
+  onEnded?(): void;
+  onError?(error: any): void;
+  onDuration?(duration: number): void;
+  onProgress?(state: { played: number, loaded: number }): void;
+}
+
+export default class ReactPlayer extends React.Component<ReactPlayerProps, any>{
+  seekTo(fraction: number): void;
+}

package.json

@@ -3,6 +3,7 @@
   "version": "0.12.1",
   "description": "A react component for playing a variety of URLs, including file paths, YouTube, SoundCloud, Streamable, Vidme and Vimeo",
   "main": "lib/ReactPlayer.js",
+  "typings": "index.d.ts",
   "scripts": {
     "clean": "rimraf lib demo",
     "build:webpack": "NODE_ENV=production webpack --config webpack.config.prod.js",