Get and set frame rate

lib/minifb/src/minifb.zig

@@ -44,6 +44,22 @@ pub const Window = struct{
             else => return UpdateError.InternalError,
         }
     }
-
-
 };
+
+pub fn getTargetFPS() u32 {
+    return minifb_c.mfb_get_target_fps();
+}
+
+pub fn setTargetFPS(fps: u32) void {
+    minifb_c.mfb_set_target_fps(fps);
+}
+
+// TODO Figure out how to run this once I have Internet access.
+test "set and get target FPS" {
+    const max = 40;
+    var fps: u32 = 30;
+    while (fps < max) {
+        setTargetFPS(fps);
+        try std.testing.expectEqual(fps, getTargetFPS());
+    }
+}