Update ReadME

README.md

@@ -54,9 +54,10 @@ pip install networkx==2.4 urdfpy mr-urdf-loader
     ```shell
     ros2 launch iiwa.launch.py
     ```
-3. In a separate tab navigate to the workspace:
+3. In a separate tab navigate to the workspace and source the environment:
     ```shell
     cd ~/trajektorien-des-menschlichen-aufstehens-fuer-die-entwicklung-eines-kooperativen-assistenzsystems/ros2_ws/
+    source install/setup.bash
     ```
 4. And launch one of the simulations with the simple robot (ex: 1 degree of freedom):
     ```shell