added basic explanations to the package.xml which will explain the overall...

added basic explanations to the package.xml which will explain the overall functionality and structure of the node.

package.xml

@@ -3,7 +3,16 @@
 <package format="3">
   <name>pozyx_driver</name>
   <version>0.0.0</version>
-  <description>TODO: Package description</description>
+  <description>
+    The ROS driver for the Pozyx RTLS (Real Time Localisation System). This driver is currently 
+    provided to major publishers:
+    - robot_position: returns the current position of the robot as a geometry_msgs/msg/Point message.
+    - pozyx_imu: provides the IMU (Inertial Measurement Unit) data as sensor_msgs/msg/IMU message. 
+      The co-variant matrix has default values.
+    The node itself is structured so that the main executable can be found inside the pozyx_driver 
+    folder and it's publishers inside the library folder. the classes for the publishers are modified 
+    pypozyx examples that include additional methods for the publishers.
+    </description>
   <maintainer email="koroyeldiores@gmail.com">Guelakais</maintainer>
   <license>Apache2</license>