📝 Add prettier badge.

aofleejay · aofleejay · commit e94657ad2eae · 2019-09-07T04:13:26.000+07:00
diff --git a/testing-framework/README.md b/testing-framework/README.md
@@ -1,4 +1,7 @@
 # Understanding Testing Framework
+
+[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
+
 Build testing framework from scratch.
 
 ## Quick start.
