전체적인 시스템 추가.

lib/common/data/upcoming_study.dart

@@ -0,0 +1,23 @@
+
+class UpcomingStudy {
+  final String planId;
+  final String planTitle;
+  final String planTeacher;
+  final String thumbnail;
+
+  UpcomingStudy({
+    required this.planId,
+    required this.planTitle,
+    required this.planTeacher,
+    required this.thumbnail,
+  });
+
+  factory UpcomingStudy.fromJson(Map<String, dynamic> json) {
+    return UpcomingStudy(
+      planId: json['casestudy lesson id'] ?? '아이디 없음',
+      planTitle: json['course_name'] ?? '제목 없음',
+      planTeacher: json['course_description'] ?? '선생님',
+      thumbnail: json['course_thumbnail'] ?? '',
+    );
+  }
+}