I wanted to use SDL with Swift on Windows, and it took me a frustratingly long time to figure out how to set that up. I'm providing this template as a reference/starting point for anyone else who might need it.
Before running your project for the first time, you need to copy the .dll file from the Dependencies/SDL3 folder into your target's build folder (I.E. the folder holding the actual executable). Other than that, this project should just work out of the box.