Import external js file

Hi!
I want to use OpenSheetMusicDisplay in my project (GitHub - opensheetmusicdisplay/opensheetmusicdisplay: OpenSheetMusicDisplay renders sheet music in MusicXML format in your web browser based on VexFlow. OSMD is brought to you by PhonicScore.com.)
How and where shoul I import the script?
How to use it and test the code?
Thank you,
Maxime