Adding parameters.

README.md

 # axis_imu
 
-Driver to Axis IMU.
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+Driver to Axis IMU.
+
+
+Usage:
+```bash
+rosrun axis_imu axis_imu _frame_id:=imu_frame _rate:=100 _root_passwd:=pass _camera_ip:=192.168.7.19 _driver_ip:=192.168.7.160 _port:=5000
+```
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