chore: update README to add more info (#2)

Author: adohe

README.md

@@ -1,3 +1,7 @@
 # component-base
 
+[![Test](https://github.com/KusionStack/component-base/workflows/Test/badge.svg)](https://github.com/KusionStack/component-base/actions)
+[![Coverage](https://coveralls.io/repos/github/KusionStack/component-base/badge.svg)](https://coveralls.io/github/KusionStack/component-base)
+[![Go Reference](https://pkg.go.dev/badge/github.com/KusionStack/component-base.svg)](https://pkg.go.dev/github.com/KusionStack/component-base)
+
 This repo contains common code shared by all KusionStack core components.