说明： 文本编辑器，有简单的界面，可以实现文本文件的创立，装入，保存，显示和编辑的功能。数据结构要求用链表，要实现链表的建立，添加，删除，插入，参考界面是TC2.0 (text editors, a simple interface, can achieve the creation of text files, loading, storage, display and editing functions. Requested data structure used chain, in order to achieve the establishment of the linked list, add, delete, insert, the reference interface is READ)
