added custom geojson file for museum building

js/map.js

@@ -107,4 +107,19 @@ map.on('load', function() {
     }
   }, labelLayerId);
 
+  map.addLayer({
+    'id': 'room-extrusion',
+    'type': 'fill-extrusion',
+    'source': {
+        'type': 'geojson',
+        'data': 'geojson/museum.geojson'
+    },
+    'paint': {
+        'fill-extrusion-color': ['get', 'color'],
+        'fill-extrusion-height': ['get', 'height'],
+        'fill-extrusion-base': ['get', 'base_height'],
+        'fill-extrusion-opacity': 0.5
+    }
+  });
+
 });