Update README.md

Author: zhigenzhao

README.md

@@ -7,7 +7,7 @@ Pico teleoperation demo written in python for both mujoco simulation and robot h
 This project provides a framework for controlling robots in robot hardware and MuJoCo simulation through XR (VR/AR) input devices. It allows users to manipulate robot arms using natural hand movements captured through XR controllers.
 
 ## Installation
-1. Download and install `XRoboToolkit PC Service` [todo: include .deb package link]
+1. Download and install [XRoboToolkit PC Service](https://github.com/XR-Robotics/XRoboToolkit-PC-Service/releases/download/v1.0.0/XRoboToolkit-PC-Service_1.0.0_ubuntu_amd64.deb). Run the installed program before running the following demo.
 
 2.  **Clone the repository:**
     ```bash
@@ -89,4 +89,4 @@ Hardware Control
 - [`ur_rtde`](https://gitlab.com/sdurobotics/ur_rtde): interface for controlling and receiving data from a UR robot, MIT License
 
 ## License
-This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.