基于哈希表的简单通讯录系统

代码说明：

  从文件读取固定格式的员工信息，并创建哈希表。 并具有插入、浏览、删除、修改等功能编辑员工信息。(Read staff information in a fixed format from a file and create a hash table. It also has functions of insertion, browsing, deletion and modification to edit employee information.)