added umbLoadIndicator documentation - first draft

src/Umbraco.Web.UI.Client/src/common/directives/components/umbloadindicator.directive.js

@@ -1,3 +1,50 @@
+/**
+@ngdoc directive
+@name umbraco.directives.directive:umbLoadIndicator
+@restrict E
+
+@description
+Use this directive to generate a loading indicator.
+
+<h3>Markup example</h3>
+<pre>
+    <div ng-controller="Umbraco.Controller as vm">
+
+        <umb-load-indicator
+            ng-if="vm.loading">
+        </umb-load-indicator>
+
+        <div class="content" ng-if="!vm.loading">
+            <p>{{content}}</p>
+        </div>
+
+    </div>
+</pre>
+
+<h3>Controller example</h3>
+<pre>
+    (function () {
+        "use strict";
+
+        function Controller(myService) {
+
+            var vm = this;
+
+            vm.content = "";
+            vm.loading = true;
+
+            myService.getContent().then(function(content){
+                vm.content = content;
+                vm.loading = false;
+            });
+
+        }
+
+        angular.module("umbraco").controller("Umbraco.Controller", Controller);
+    })();
+</pre>
+**/
+
 (function() {
   'use strict';