完善文档并添加示例插件

plugins/giftManager/schemas/__init__.py

@@ -0,0 +1,12 @@
+from flask_marshmallow.sqla import SQLAlchemyAutoSchema
+
+from ..models import Gift
+
+
+class GiftSchema(SQLAlchemyAutoSchema):
+    class Meta:
+        model = Gift  # table = models.Album.__table__
+        # include_relationships = True  # 输出模型对象时同时对外键，是否也一并进行处理
+        include_fk = True  # 序列化阶段是否也一并返回主键
+        # fields= ["id","name"] # 启动的字段列表
+        # exclude = ["id","name"] # 排除字段列表