Add DirectX manipulating lib

includes/DirectX.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <reshade.hpp>
+
+/**
+ * @brief Retrieves Display mode.
+ *
+ * This function should be calld on event `on_present`
+ *
+ * @param swapchain retrieved from on_present event
+ */
+bool IsExclusiveFullscreen(reshade::api::swapchain* swapchain);