docs: Update login page. (#113)

Signed-off-by: IRONICBo <47499836+IRONICBo@users.noreply.github.com>

README.md

@@ -34,6 +34,10 @@
 3. Support multi-channel customer service, and easy to integrate with third-party systems.
 4. Easy to deploy and secondary development.
 
+## 📺 System Preview
+
+![Login Page](assets/images/login_page.png)
+
 ## 🛫 Quick start 
 
 > **Note**: You can get started quickly with OpenKF.

README_zh-CN.md

@@ -13,6 +13,11 @@
 3. 支持多渠道客服，并能与第三方系统轻松集成。
 4. 部署简单，便于二次开发。
 
+## 📺 系统预览 
+
+![登录界面](assets/images/login_page.png)
+
+
 ## 🛫 快速开始
 
 > **注意**：您可以通过以下步骤快速开始使用 OpenKF。