Update 'README.md'

README.md

@@ -1,2 +1,50 @@
 # flask-marshmallow
+序列化和反序列化，支持 JSON、YAML 和 XML 等
 
+
+## Usage
+```
+from flask import Flask, request, jsonify
+from flask_marshmallow import Marshmallow
+
+app = Flask(__name__)
+ma = Marshmallow(app)
+
+# 定义数据模型类
+class User:
+    def __init__(self, id, username, email):
+        self.id = id
+        self.username = username
+        self.email = email
+
+# 定义序列化器类
+class UserSchema(ma.Schema):
+    class Meta:
+        fields = ('id', 'username', 'email')
+
+# 创建用户数据
+users_data = [
+    User(id=1, username='john_doe', email='john@example.com'),
+    User(id=2, username='jane_doe', email='jane@example.com')
+]
+
+# 创建用户数据模式实例
+user_schema = UserSchema()
+users_schema = UserSchema(many=True)
+
+# 路由处理函数：获取所有用户数据
+@app.route('/users', methods=['GET'])
+def get_users():
+    return jsonify(users_schema.dump(users_data))
+
+# 路由处理函数：创建新用户数据
+@app.route('/user', methods=['POST'])
+def create_user():
+    new_user = User(id=request.json['id'], username=request.json['username'], email=request.json['email'])
+    users_data.append(new_user)
+    return user_schema.jsonify(new_user)
+
+if __name__ == '__main__':
+    app.run(debug=True)
+
+```