added resizer

lib/danbooru_image_resizer/Reader.h

@@ -0,0 +1,14 @@
+#ifndef READER_H
+#define READER_H
+
+#include <stdio.h>
+
+class Resizer;
+class Reader
+{
+public:
+	virtual ~Reader() { }
+	virtual bool Read(FILE *f, Resizer *rp, char errorbuf[1024]) = 0;
+};
+
+#endif