add type definitions

dist/color-thief-node.d.ts

@@ -0,0 +1,19 @@
+/**
+ * Color Thief Node v3.0.0
+ * by Lokesh Dhakar - http://www.lokeshdhakar.com
+ *
+ * Thanks
+ * ------
+ * Nick Rabinowitz - For creating quantize.js.
+ * John Schulz - For clean up and optimization. @JFSIII
+ * Nathan Spady - For adding drag and drop support to the demo page.
+ *
+ * License
+ * -------
+ * Copyright Lokesh Dhakar
+ * Released under the MIT license
+ * https://raw.githubusercontent.com/lokesh/color-thief/master/LICENSE
+ *
+ * @license MIT
+ */
+export {};