Specify installation path for Windows in README.md

Author: moriglia

README.md

@@ -228,7 +228,7 @@ Either option you chose for building the `stdlib`, you can install it with:
 fpm install --profile release
 ```
 The command above will install the following files:
-- `libstdlib.a` into `~/.local/lib/`
+- `libstdlib.a` into `~/.local/lib/` (Unix) or `C:\Users\<username>\AppData\Roaming\local\` (Windows)
 - all the `.[s]mod` files produced by the compiler into `~/.local/include/`
 
 You can change the installation path by setting the prefix option to `fpm`: