implement a series of courses

[stevending1st]

If you need to implement a series of courses, you can add the corresponding courses to the series of courses and sort them. The series of courses should also contain some other necessary information, such as series course names, introduction, cooperative communities, etc.

The backend also needs to provide relevant query-able interfaces, such as series course list query, series course details, and series course management.

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需要实现系列课程，可以将对应课程加入系列课程并进行排序，系列课程还应包含一些其他必要的信息，如系列课程名称、简介、合作社区等。

后端还需要提供相关可查询的接口，如系列课程列表查询、系列课程详情、系列课程管理。