Did you get one of these Google Play Developer Policy Violation Emails?
It is fair simple.
Add you app name, select the dev type and enter your company name or your real name if you are a individual developer.
Now select the services on the right you are using in your app.
Tap on the button „Generate“ and you see your privacy site.
Scroll down to the bottom and select „Download HTML„.
Upload it to your webspace and link this website inside the Google Play Developer Console.
Another more detailed solution (not free) is the website https://www.iubenda.com!