Add shield for unit tests

Author: hirasso

README.md

@@ -6,7 +6,8 @@
 
 <div align="center">
 
-[![Test status](https://img.shields.io/github/actions/workflow/status/hirasso/scrollmirror/e2e-tests.yml?branch=main&label=tests)](https://github.com/hirasso/scrollmirror/actions/workflows/e2e-tests.yml)
+[![e2e test status](https://img.shields.io/github/actions/workflow/status/hirasso/scrollmirror/e2e-tests.yml?branch=main&label=e2e%20tests)](https://github.com/hirasso/scrollmirror/actions/workflows/e2e-tests.yml)
+[![unit test status](https://img.shields.io/github/actions/workflow/status/hirasso/scrollmirror/unit-tests.yml?branch=main&label=unit%20tests)](https://github.com/hirasso/scrollmirror/actions/workflows/unit-tests.yml)
 [![License](https://img.shields.io/github/license/hirasso/scrollmirror.svg)](https://github.com/hirasso/scrollmirror/blob/master/LICENSE)
 
 </div>