JSY-42593 add：新增readme

README.md

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+<h1 align="center">Welcome to sso-saml-login 👋</h1>
+<p>
+  <img src="https://img.shields.io/badge/version-1.0.0-blue.svg?cacheSeconds=2592000" />
+</p>
+
+> SAML SSO Demo for Jiushuyun with Java.
+
+## 预览
+
+### 🏠 [Homepage](https://www.jiushuyun.com)
+
+Read the [Documents](http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html) to lean what SAML is.
+
+
+## 说明
+该仓库提供的是服务消费方(SP)如何和身份提供方(IDP)进行身份验证和服务消费。
+
+
+
+## 下载
+
+Project is tested with SpringBoot 2.5.14.
+
+```sh
+git clone https://code.fanruan.com/jsy/sso-login.git
+```
+
+## 对接九数云
+请参照九数云帮助文档
+
+
+