adde p model

Author: sunghowoo

param/dxl_model/dynamixel.model

@@ -33,6 +33,7 @@ Number	Name
 1240	xc330_m288.model
 1270	xw430_t333.model
 1310	xw540_h260.model
+2000  ph42_020_s300.model
 4000	ym070_210_m001.model
 4020	ym070_210_r051.model
 4030	ym070_210_r099.model