docs: Add link of doc (#21)

* docs: Add link of doc

* docs: Add link of doc

packages/semi-theme-default/README.md

@@ -3,7 +3,7 @@
 
 By default, the theme package will be automatically installed as dependence of `@douyinfe/semi-foundation`.
 
-You can make a custom theme through [Semi Design System]().
+You can make a custom theme through [Semi Design System](https://semi.design/dsm).
 
 ## Directory Structure