update Readme

README.md

@@ -27,12 +27,20 @@ using `pipenv`:
 
 ## Unit tests
 
-Run this:
+To perform the unit tests present run:
 
     $ make -C lib-visualodo tests-clean tests
 
 The output is generated in the folder in `lib-visualodo/out-comptests/`.
 
+## Visualization of the results
+
+In case you want to enable the plotting features (i.e. image containing the used mask, the feature extraction and matching or the outlier filtering), set the relevant variable to `True` in `lib-visualodo/src/duckietown-visualodo/data/default.yaml`
+
 ## Documentation
 
 Detailed documentation for running the demo and on the implementation of the visual odometry pipeline can be found on the [Duckiebook](http://docs.duckietown.org/DT18/opmanual_duckiebot/out/demo_visualodometry.html)
+
+## Code structure
+
+The package is structured the following way: in `ros-visualodo`, the code responsible for the node instantiation and the communication with other nodes is placed. In `lib-visualodo`, all the actual logic is implemented, the parameters are contained and the unit tests are present.