Add new resource link for DataEase book

Author: maninhill

docs/index.md

@@ -70,3 +70,4 @@
     - **获取新一代数据可视化分析平台应用指南：** [新一代数据可视化分析工具应用指南](https://fit2cloud-support.oss-cn-beijing.aliyuncs.com/%E3%80%8A%E6%96%B0%E4%B8%80%E4%BB%A3%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%86%E5%8C%96%E5%88%86%E6%9E%90%E5%B7%A5%E5%85%B7%E5%BA%94%E7%94%A8%E6%8C%87%E5%8D%97%E3%80%8B%EF%BC%88DataEase%E7%BC%96%E8%91%97%EF%BC%89.pdf)
     - **DataEase 知识库：** https://kb.fit2cloud.com/categories/dataease
     - **飞致云培训认证中心：** https://edu.fit2cloud.com/index 
+    - ** 华东师大 & DataEase 联合出品书籍：《《数据可视化分析与实践》：** https://item.jd.com/10207058297099.html