Update README.md

README.md

@@ -23,7 +23,12 @@ This repository was created by modifying the pre-existing Keras RetinaNet implem
     |   |   ├── training
     |   |   └── testing
     |   └── data_object_label_2
-    |       └── training
+    |   |   └── training
+    |   └── devkit_object
+    |       ├── cpp
+    |       ├── mapping
+    |       └── matlab
+    |       
     └── road_planes_database.mat
 ```
 In the above example, the `road_planes_database.mat` file is an (N x 4) array of ground planes for the KITTI dataset. Different versions of this file can be found [here](https://github.com/arangesh/Ground-Plane-Polling/tree/master/road_planes_database).