Under HACS -> Integrations, select the 'Three dots' icon in the top right corner, select 'Custom Repository', and add 'https://github.com/erlendsellie/HomeAssistant-SkisporetV2' as an integration (category). It will searchable as 'Skisporet'. Click it, and select 'Download this repository with Hacs'. Then restart Home Assistant, and go to the integrations page to configure it.
Enter the segment ID found in the URL. It will then create a new sensor in your installation.