Add basic TypeScript definition

Author: rpetrich

package.json

@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "description": "A loader-agnostic CSS Modules implementation, based on PostCSS",
   "main": "lib/index.js",
+  "types": "src/index.d.ts",
   "directories": {
     "test": "test"
   },

src/index.d.ts

@@ -0,0 +1,9 @@
+export default class Core {
+	static values: any;
+	static localByDefault: any;
+	static extractImports: any;
+	static scope: any;
+	static defaultPlugins: any[];
+	constructor(plugins: any[]);
+	load(sourceString: string, sourcePath: string, trace?: any, pathFetcher?: any): { injectableSource: string, exportTokens: { [name: string]: string } };
+}