Add NightShot source

include/gif_options_window.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "config.hpp"
+#include "gif_recorder.hpp"
+#include "settings.hpp"
+
+#include <windows.h>
+
+namespace gif_options_window {
+
+// Native modal Win32 window. Returns true when the user presses Start.
+[[nodiscard]] bool show(HWND owner, const settings::AppSettings& defaults,
+                        gif_recorder::Options& options);
+
+} // namespace gif_options_window