First sketch of layers

src/config.js

@@ -212,7 +212,24 @@ const config : Config = {
         }
       ]
     }
-  }
+  },
+  layers: [
+    {
+      image: "img/layers/rzl/rooms.png",
+      forceVisibility: "on",
+      name: "RaumZeitLabor"
+    },
+    {
+      image: "img/layers/rzl/details.png",
+      forceVisibility: "on",
+      name: "Details"
+    },
+    {
+      image: "img/layers/rzl/labels.png",
+      forceVisibility: "on",
+      name: "Labels"
+    }
+  ]
 };
 
 export default config;