update readme

README.md

@@ -32,7 +32,7 @@ In PaddleFL, horizontal and vertical federated learning strategies will be imple
 
 ## Framework design of PaddleFL
 
-<img src='images/FL-training.png' width = "1000" height = "320" align="middle"/>
+<img src='images/FL-training.png' width = "1000" height = "411.5" align="middle"/>
 
 In PaddleFL, components for defining a federated learning task and training a federated learning job are as follows:
 
@@ -52,6 +52,8 @@ In PaddleFL, components for defining a federated learning task and training a fe
 
 - **FL-Worker**: Each organization participates in federated learning will have one or more federated workers that will communicate with the federated parameter server.
 
+- **FL-scheduler**: Decide which set of trainers can join the training before each updating cycle. 
+
 ## Install Guide and Quick-Start
 
 Please reference [Quick Start](https://paddlefl.readthedocs.io/en/latest/instruction.html) for installation and quick-start example.

README_cn.md

@@ -29,7 +29,7 @@ PaddleFL是一个基于PaddlePaddle的开源联邦学习框架。研究人员可
 
 ## PaddleFL框架设计
 
-<img src='images/FL-training.png' width = "1300" height = "310" align="middle"/>
+<img src='images/FL-training.png' width = "1300" height = "535" align="middle"/>
 
 在PaddeFL中，用于定义联邦学习任务和联邦学习训练工作的组件如下：
 
@@ -49,6 +49,8 @@ PaddleFL是一个基于PaddlePaddle的开源联邦学习框架。研究人员可
 
 - **FL-Worker**: 参与联合学习的每个组织都将有一个或多个与联合参数服务器通信的Worker。
 
+- **FL-Scheduler**: 训练过程中起到调度Worker的作用，在每个更新周期前，决定哪些Worker可以参与训练。
+
 ## 安装指南和快速入门
 
 请参考[快速开始](https://paddlefl.readthedocs.io/en/latest/instruction.html)。