Add basic save file structure

- Create save.h with gameDataSav struct
- Add placeholder functions for save handling
- Foundation for BOTW save data manipulation

source/save_basic.h

@@ -0,0 +1,15 @@
+#ifndef SAVE_H
+#define SAVE_H
+
+#include <stdlib.h>
+
+typedef struct 
+{
+    size_t length;
+    char * saveFile;
+} gameDataSav;
+
+void processSave();
+void openSave();
+
+#endif