add cityscapes-instance-id2label

cityscapes-instance-id2label.json

@@ -0,0 +1,10 @@
+{
+  "0": "person",
+  "1": "rider",
+  "2": "car",
+  "3": "truck",
+  "4": "bus",
+  "5": "train",
+  "6": "motorcycle",
+  "7": "bicycle"
+}