The library can be installed from the Library Manager under the name 'Plotter' (with a capital P). The GitHub repo for the library hosts documentation. To use a program using the library, launch the listener app while the Arduino is running.
This depends on what operating system you are using. Refer to the list below.
The library needs exclusive access to the serial port so you cannot use any Serial.print()s etc. in your program.
Footnotes
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On Mac OS, there is an issue with Gatekeeper. Because of this, once you have extracted the app to the Applications folder, you have to open Terminal and run the command
xattr -rc /Applications/listener.app
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