Hi Sam,
Due to the way that Adapt is structured it would be quite hard to convert the static slides of Powerpoint to an Adapt course that is scroll based and supports a wide variety of screen sizes. Also consider the different components that make up an Adapt project that require interactions more than just reading and going to the next slide.
As Brian said if it's a small of amount of content it should be quick and easy to convert to Adapt. Otherwise I would recommend looking into another Authoring Tool that more closely replicates Powerpoint.
Simon