Add quality to toc

Author: androiddevnotes

README.md

@@ -72,6 +72,7 @@ The content is generated from [Android Developer Sitemap](https://developer.andr
   - [Google](#google)
   - [Samples](#samples)
   - [Teach](#teach)
+  - [Quality](#quality)
 
 - [**Android Open Source Project**](#android-open-source-project)