Add abs.d.ts

Author: AyaMorisawa

abs/abs-tests.ts

@@ -0,0 +1,5 @@
+/// <reference path="./abs.d.ts" />
+
+import Abs from 'abs';
+
+const x: string = Abs('/foo');

abs/abs.d.ts

@@ -0,0 +1,14 @@
+// Type definitions for abs 1.1.0
+// Project: https://github.com/IonicaBizau/node-abs
+// Definitions by: Aya Morisawa <https://github.com/AyaMorisawa>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module "abs" {
+	/**
+	 * Compute the absolute path of an input.
+	 * @param input The input path.
+	 */
+	function Abs(input: string): string;
+
+	export default Abs;
+}