add: add MaterialBundle example to the main page

www/resources/meta-data/qmlprojects.json

 {
     "projects": [
-        { "file": "ClusterTutorial.qmlrc"},
-        { "file": "CoffeeMachine.qmlrc"},
-        { "file": "EBikeDesign.qmlrc"},
-        { "file": "SideMenu.qmlrc"},
-        { "file": "WebinarDemo.qmlrc"}
+        {
+            "file": "ClusterTutorial.qmlrc"
+        },
+        {
+            "file": "CoffeeMachine.qmlrc"
+        },
+        {
+            "file": "EBikeDesign.qmlrc"
+        },
+        {
+            "file": "SideMenu.qmlrc"
+        },
+        {
+            "file": "WebinarDemo.qmlrc"
+        },
+        {
+            "file": "MaterialBundle.qmlrc"
+        }
     ]
-}
+}
\ No newline at end of file