Add new file

main.h

+#ifndef MAIN_H
+#define MAIN_H
+
+#include <ncurses.h>
+#include "changedata.h"
+
+#define STR_MAX 128
+#define ENTER_KEY 10
+#define UP_KEY 65
+#define DOWN_KEY 66
+#define NONE -1
+
+WINDOW *create_newwin(int height, int width, int starty, int startx);
+void printIntro(int *row, int *col);
+int printIntroMenu(int *row, int *col);
+
+enum admin{FLIGHT_INFO, CLIENT_INFO, EXIT};
+enum assistant{USER_INFO, CHECK_IN};
+enum user{NAME, DOCUMENT, SEAT, BAGGAGE, BACK};
+
+#endif