Update README.md

README.md

 # Setup
 
-(1) Clone into your ROS workspace, for example:
+(1) Dependency installation:
+
+```
+sudo apt install python3-pip
+python3 -m pip install inputs
+```
+
+(2) Clone into your ROS workspace, for example:
 
 ```
 cd ~/ros_ws/src
 git clone git@code.umd.edu:robotics-at-maryland/qubo_gui.git
 ```
 
-(2) Build your ROS workspace:
+(3) Build your ROS workspace:
 
 ```
 cd ~/ros_ws
 colcon build
 ```
 
-(3) Tell rqt to find our plugins (may have to do this if you create a new plugin, but otherwise should only need to do it once):
+(4) Tell rqt to find our plugins (may have to do this if you create a new plugin, but otherwise should only need to do it once):
 
 ```
 rqt --force-discover
 ```
 
-(4) For now, run `rqt` from the commandline. Then load the plugins you want inside the rqt GUI.
+(5) For now, run `rqt` from the commandline. Then load the plugins you want inside the rqt GUI.
 
 - Click "Plugins" in the menu bar.
 - Find the plugin you want.