Add types definition for jstz (jsTimezoneDetect) (#11716)

* Add types definition for jstz (jsTimezoneDetect https://bitbucket.org/pellepim/jstimezonedetect)

* Rename to jstimezonedetect

jstimezonedetect/jstimezonedetect-tests.ts

@@ -0,0 +1,5 @@
+/// <reference path="jstimezonedetect.d.ts" />
+
+import * as jstz from 'jstimezonedetect';
+
+jstz.determine().name() === 'America/Montreal';

jstimezonedetect/jstimezonedetect.d.ts

@@ -0,0 +1,16 @@
+// Type definitions for jsTimezoneDetect
+// Project: https://bitbucket.org/pellepim/jstimezonedetect
+// Definitions by: Olivier Lamothe <https://github.com/olamothe/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface JsTimezoneDetect {
+    determine: ()=> {
+        name: ()=> string;
+    }
+}
+
+declare var jstimezonedetect: JsTimezoneDetect;
+
+declare module "jstimezonedetect" {
+    export = jstimezonedetect;
+}