Add ImGui

src/render/imguimanager.h

@@ -0,0 +1,28 @@
+#ifndef IMGUI_MGR_H
+#define IMGUI_MGR_H
+
+#include <imgui.h>
+
+#include "core.h"
+
+class ImGuiManager
+{
+public:
+	void Init();
+	void Shutdown();
+
+	void BeginFrame();
+	void EndFrame();
+
+	void PollEvents(SDL_Event* _p_event);
+
+private:
+	void Draw();
+
+private:
+	bool m_ready = false;
+};
+
+extern ImGuiManager g_ImGuiManager;
+
+#endif // !IMGUI_MGR_H