新增readme

src/api/employee.js

@@ -1,4 +1,5 @@
 import request from './request'
+import { DEPARTMENT_LIST } from '../constants/departments'
 
 // 获取员工列表
 export const getEmployeeList = (params, config) => {
@@ -29,3 +30,15 @@ export const updateEmployee = (id, data) => {
 export const deleteEmployeeAPI = (id) => {
   return request.delete(`/employees/${id}`)
 }
+
+/**
+ * 获取部门列表
+ *
+ * 当前返回本地常量（与后端数据库一致）。
+ * 当后端部署了 GET /api/departments 接口后，将下方注释替换为：
+ *
+ *   export const getDepartmentList = () => request.get('/departments')
+ */
+export const getDepartmentList = () => {
+  return Promise.resolve({ code: 0, message: 'ok', data: DEPARTMENT_LIST })
+}