Add release_notes

Author: saikishor

doc/release_notes.rst

@@ -17,6 +17,10 @@ imu_sensor_broadcaster
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 * IMU sensor broadcaster is now a chainable controller. It supports a calibration by means of a rotation, defined as euler angles, to its target frame. (`#1833 <https://github.com/ros-controls/ros2_controllers/pull/1833/files>`__).
 
+interfaces_state_broadcaster
+*********************************
+* 🚀 The interfaces_state_broadcaster was added 🎉 (`#2006 <https://github.com/ros-controls/ros2_controllers/pull/2006>`_).
+
 joint_trajectory_controller
 *******************************
 * The controller now supports the new anti-windup strategy of the PID class, which allows for more flexible control of the anti-windup behavior. (`#1759 <https://github.com/ros-controls/ros2_controllers/pull/1759>`__).