feat(decorator): Define creation of decorator at decorator/index.js a…

…nd added USAGE File

decorator/USAGE

@@ -0,0 +1,17 @@
+Description:
+    Creates a new AngularJS decorator for a specified service
+
+Example:
+    yo angular:decorator serviceName [--coffee]
+
+    This will create:
+        app/scripts/decorators/serviceNameDecorator.js
+
+
+    if you want to use multiple decorator for a service,
+    you are able to use the second argument
+
+    yo angular:decorator serviceName serviceNameLogging [--coffee]
+
+    This will create:
+            app/scripts/decorators/serviceNameLoggingDecorator.js

decorator/index.js

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+'use strict';
+var path = require('path');
+var util = require('util');
+var ScriptBase = require('../script-base.js');
+var angularUtils = require('../util.js');
+
+
+module.exports = Generator;
+
+function Generator() {
+    ScriptBase.apply(this, arguments);
+    var postFix = "Decorator";
+
+    //TODO: Any better way in yeoman to get this value?
+    var fileName = arguments[0][1];
+    if(fileName === undefined){
+        fileName = this.name+postFix;
+    }
+    else{
+        fileName += postFix;
+    }
+    this.fileName = fileName;
+}
+
+util.inherits(Generator, ScriptBase);
+
+Generator.prototype.createDecoratorFiles = function createDecoratorFiles() {
+    this.appTemplate('decorator', 'scripts/decorators/' + this.fileName);
+    this.addScriptToIndex('decorators/' + this.fileName);
+};