Update readme (#456)

Author: cheukt

README.md

@@ -10,7 +10,7 @@ Currently, we have pre-built binaries for macOS (both Intel and Apple Silicon),
 
 `pip install viam-sdk`
 
-If your system is not supported, read further on how to install from source.
+Windows is not supported. If you are using Windows, install `viam-sdk` in WSL. For other unsupported systems, read further on how to install from source.
 
 ### Upgrading
 To upgrade, simply run the `pip install` command with the `-U` option: