update project structure & create Makefile

include/json.h

@@ -0,0 +1,11 @@
+#include "courses.h"
+#include "students.h"
+
+#ifndef JSON_H_INCLUDED
+#define JSON_H_INCLUDED
+
+int createDirectory(const char *dir_name);
+int writeStudentsToJson(STUDENT *students, size_t numberOfStudents, char output_dir[]);
+int writeCoursesToJson(COURSE *courses, size_t numberOfCourses, char output_dir[]);
+
+#endif