Update README.md

Author: han-xudong

README.md

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 ## Description
 
-PyDHgripper is a Python library that allows you to control the DH gripper with Python. The DH grippers are a series of robot grippers which is widely used in grasping tasks. This library is based on the Modbus protocol, and the support types of DH gripper includes AG-95, DH-3, RGD, and PGE series.
+PyDHgripper is a Python library that allows you to control the [DH gripper](https://en.dh-robotics.com/) with Python. The DH grippers are a series of robot grippers which is widely used in grasping tasks. This library is based on the Modbus protocol, and the support types of DH gripper includes AG-95, DH-3, RGD, and PGE series.
 
 ## Hardware Requirements