readme: clarify nswitch installation

README.md

@@ -46,6 +46,7 @@ Latest [automatic builds](https://github.com/fgsfdsfgs/perfect_dark/releases/tag
 * [i686-windows](https://github.com/fgsfdsfgs/perfect_dark/releases/download/ci-dev-build/pd-i686-windows.zip)
 * [x86_64-linux](https://github.com/fgsfdsfgs/perfect_dark/releases/download/ci-dev-build/pd-x86_64-linux.tar.gz)
 * [i686-linux](https://github.com/fgsfdsfgs/perfect_dark/releases/download/ci-dev-build/pd-i686-linux.tar.gz)
+* [arm64-nswitch](https://github.com/fgsfdsfgs/perfect_dark/releases/download/ci-dev-build/pd-arm64-nswitch.zip)
 
 If you are looking for netplay builds (the `port-net` branch), see [this link](https://github.com/fgsfdsfgs/perfect_dark/blob/port-net/README.md#download).
 
@@ -69,6 +70,12 @@ Additional information can be found in the [wiki](https://github.com/fgsfdsfgs/p
 
 A GPU supporting OpenGL 3.0 or above is required to run the port.
 
+### Installing the Nintendo Switch version
+
+The Nintendo Switch build ZIP comes with all 3 regions in different folders: `perfectdark`, `perfectdark_pal` and `perfectdark_jon`.
+
+Take the folder for the region you want and put it into the `/switch` folder on your SD card, then put in your ROM as described above.
+
 ## Controls
 
 1964GEPD-style and Xbox-style bindings are implemented.