GDPR Data Privacy Policy
CiviCRM -as the software- doesn't have a privacy policy, because it doesn't hold any personal data.

Your specific instance of that software, as installed on your server or hosted by one of your provider does store personal data. Check with your provider if they have a privacy policy.

However, the privacy policy depends on what personal data you collect and what your organisation does with it, so you are likely to have to adjust based on your own unique way of using CiviCRM.

While you detail that, may I suggest you to look at how your CiviCRM might be connected to other providers, for instance to process the credit card donations or to send your emails? you will need to check what personal data of your contacts you share with them to let them perform the service, and clearly explain that in your privacy policy.

And lastly, we found the easiest way to be GDPR compliant is to be enforce data minimisation, eg only collect the data you need and know/explain why you collect it (and get consent!). For instance, are you really calling your contacts? if not, it's probably simplier and safer to remove the phone field.

Good luck!