Updated the README file.

README.md

@@ -72,6 +72,21 @@ The main launch file (*node.launch*) has the following arguments:
 * **odom_topic** (default=/odom): Name of the odom topic to be used
 * **control_topic** (default=/control): Name of the control topic to be used.
 
+To include the iri_model_car_control into an other launch file, include the following lines:
+
+```
+  <include file="$(find iri_model_car_control)/launch/node.launch">
+    <arg name="node_name"      value="$(arg node_name)"/>
+    <arg name="output"         value="$(arg output)"/>
+    <arg name="launch_prefix"  value="$(arg launch_prefix)"/>
+    <arg name="config_file"    value="$(arg config_file)"/>
+    <arg name="cmd_vel_topic"  value="$(arg cmd_vel_topic)"/>
+    <arg name="odom_topic"     value="$(arg odom_topic)"/>
+    <arg name="control_topic"  value="$(arg control_topic)"/>
+  </include>
+
+```
+
 ## Disclaimer
 
 Copyright (C) Institut de Robòtica i Informàtica Industrial, CSIC-UPC.