added obround might need to optomize or add rotation in the futrue

include/arc/graphics/obround.h

@@ -0,0 +1,21 @@
+#ifndef ARC_GRAPHICS_OBROUND_H_
+#define ARC_GRAPHICS_OBROUND_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "arc/graphics/color.h"
+#include "arc/graphics/renderer.h"
+#include "arc/math/obround.h"
+#include <stdint.h>
+
+void ARC_Obround_Render(ARC_Obround *obround, ARC_Renderer *renderer, ARC_Color *color);
+
+// void ARC_Rect_RenderFill(ARC_Rect *rect, ARC_Renderer *renderer, ARC_Color *color);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !ARC_GRAPHICS_OBROUND_H_