Add README.md

README.md

+# Description
+
+This package contains specific messages definition to be used by the packages on [joints group](https://gitlab.iri.upc.edu/labrobotica/ros/devices/joints).
+
+### ROS actions provided
+
+- [pointHeadTracker](https://gitlab.iri.upc.edu/labrobotica/ros/devices/joints/iri_joints_msgs/-/blob/master/action/pointHeadTracker.action):
+ To start a tracker.
+
+# Dependencies
+
+This node has the following dependencies:
+
+ * [message_generation](http://wiki.ros.org/message_generation)
+ * [std_msgs](http://wiki.ros.org/std_msgs)
+ * [geometry_msgs](http://wiki.ros.org/geometry_msgs)
+ * [actionlib_msgs](http://wiki.ros.org/actionlib_msgs)
+
+# Install
+
+- Move to workspace: `roscd && cd ../src`
+- Clone the repository: `git clone https://gitlab.iri.upc.edu/labrobotica/ros/devices/joints/iri_joints_msgs.git`
+- Compile:  `roscd && cd .. && catkin_make -DCMAKE_BUILD_TYPE=Release`
+
+However, this package is normally used as part of a wider installation (i.e. a 
+robot, an experiment or a demosntration) which will normally include a complete 
+rosinstall file to be used with the [wstool](http://wiki.ros.org/wstool) tool.