Add writer_png module

src/writer_png.h

@@ -0,0 +1,19 @@
+/* writer_png.h
+ *
+ * Declaration of the PNG writer.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+
+#ifndef __WRITER_PNG_H
+#define __WRITER_PNG_H
+
+#include <stdio.h>
+#include "scene.h"
+
+
+int write_scene_png(Scene *scene, FILE *file);
+
+
+#endif