添加README

Html/db/user_list.py

@@ -4,7 +4,7 @@ class UserList:
     def __init__(self, db_file='db/data/user/user_id_list.json'):
         """初始化用户管理，自动打开并加载 JSON 数据文件。"""
         self.db_file = db_file
-        with open(self.db_file, 'r') as f:
+        with open(self.db_file, 'r', encoding='utf-8') as f:
             self.db = json.load(f)
 
     def add_user(self, user_id, password):
@@ -12,7 +12,7 @@ class UserList:
         # 检查是否已经有该用户
         if user_id not in self.db:
             self.db[user_id] = password
-            with open(self.db_file, 'w') as f:
+            with open(self.db_file, 'w', encoding='utf-8') as f:
                 json.dump(self.db, f, indent=4)
         else:
             print(f"User with ID {user_id} already exists.")
@@ -32,7 +32,7 @@ class UserList:
         """更新用户的密码"""
         assert self.db.get(user_id) is not None, f"User with ID {user_id} does not exist."
         self.db[user_id] = new_password
-        with open(self.db_file, 'w') as f:
+        with open(self.db_file, 'w', encoding='utf-8') as f:
             json.dump(self.db, f, indent=4)
 
     def delete_user(self, user_id):