add experiment for aggregator

secretflow/security/aggregation/experiment/README.md

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+# 网空项目-安全聚合
+安全聚合项目结项提交目录  
+## 内容包括：
+- 聚合器代码
+- 辅助代码
+- 文档
+
+## 提交要求
+- 主要逻辑注释清楚
+- 删除非必要注释代码
+- Python 代码需要使用 black+isort 进行格式化（流水线包含代码规范检查卡点）

secretflow/security/aggregation/experiment/__init__.py

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+# Copyright 2023 Ant Group Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.