Add new version introduction article to docs.

docs/content/user-guide/en/getting-started/introduction.md

@@ -25,6 +25,10 @@ The CAP is modular in design and highly scalable. You have many options to choos
 
 [Article: Introduction and how to use](http://www.cnblogs.com/savorboard/p/cap.html)
 
+[Article: New features in version 3.0](https://www.cnblogs.com/savorboard/p/cap-3-0.html)
+
+[Article: New features in version 2.6](https://www.cnblogs.com/savorboard/p/cap-2-6.html)
+
 [Article: New features in version 2.5](https://www.cnblogs.com/savorboard/p/cap-2-5.html)
 
 [Article: New features in version 2.4](http://www.cnblogs.com/savorboard/p/cap-2-4.html)

docs/content/user-guide/zh/getting-started/introduction.md

@@ -25,6 +25,10 @@ CAP 采用模块化设计，具有高度的可扩展性。你有许多选项可
 
 [Article: CAP 介绍及使用](http://www.cnblogs.com/savorboard/p/cap.html)
 
+[Article: CAP 3.0 版本中的新特性](https://www.cnblogs.com/savorboard/p/cap-3-0.html)
+
+[Article: CAP 2.6 版本中的新特性](https://www.cnblogs.com/savorboard/p/cap-2-6.html)
+
 [Article: CAP 2.5 版本中的新特性](https://www.cnblogs.com/savorboard/p/cap-2-5.html)
 
 [Article: CAP 2.4 版本中的新特性](http://www.cnblogs.com/savorboard/p/cap-2-4.html)