Implemented getMonitorScale

src/main.zig

@@ -140,6 +140,8 @@ pub fn main() !void {
     defer state.deinit();
 
     var win = mfb.Window(State).open("Hello minifb-zig", Width, Height, .{ .resizable = true, .alwaysOnTop = true }) catch unreachable;
+    const scale = win.getMonitorScale();
+    std.log.info("Monitor scale: {d} * {d}", .{scale.x, scale.y});
     mfb.setTargetFPS(30);
     win.setUserData(&state);