add description and objectSize field

msg/ObjectDesignator.msg

 # Object Description
 
-string uid  				# Object's unique identifier
-string type 				# Object's type
-string[] shape				# Object's possible shapes
-string[] color				# Object's possible colors
-string location				# Object's location
-string size				# Object's size
-geometry_msgs/PoseStamped[] pose	# Object's possible 6D-poses
-string[] poseSource			# Object's possible sources (e.g. camera0)
\ No newline at end of file
+string uid                              # Object's unique identifier
+string type                             # Object's type
+string[] description                    # Object's description 
+string[] shape                          # Object's possible shapes
+string[] color                          # Object's possible colors
+string location                         # Object's location
+string size                             # Object's size
+geometry_msgs/PoseStamped[] pose        # Object's possible 6D-poses
+ObjectSize objectSize                   # Object's possible sizes like dimensions or radius
+string[] poseSource                     # Object's possible sources (e.g. camera0)