add definitions and tests for NodeJs package ms v0.7.1

ms/ms.d.ts

@@ -0,0 +1,30 @@
+// Type definitions for ms v0.7.1
+// Project: https://github.com/guille/ms.js
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'ms' {
+
+    interface IMSOptions {
+        long: boolean
+    }
+
+    /**
+    * Short/Long format for `value`.
+    *
+    * @param {Number} value
+    * @param {{long: boolean}} options
+    * @return {String}
+    */
+    function ms(value: number, options?: IMSOptions): string;
+
+    /**
+    * Parse the given `value` and return milliseconds.
+    *
+    * @param {String} value
+    * @return {Number}
+    */
+    function ms(value: string): number;
+
+    export = ms;
+}