Rosparam statement

Use rosparam sentence , Maintain parameter server , Various commands for operation , The following table ：

rosparam command	effect
rosparam set param_key param_value	Set parameters
rosparam get param_key	Display parameters
rosparam load file_name	Load parameters from file
rosparam dump file_name	Save parameters to file
rosparam delete	Delete parameters
rosparam list	List parameter names