Simply add 
inside your README.md file and that's all.
There are a few customisations that you can apply.
Query param name | Possible values | Example value | Description |
---|---|---|---|
label | label | Strangers | Overrides the default "visitors" text |
This app doesn't track anything from the users browsers, ip address or stuff like that. The requests come from GitHub CDN and it doesn't send any additional information.
I am using a free tier of Azure Web Apps. It means that sometimes the API takes too much time to start and doesn't display anything on the Readme file.