Edit README

Author: shellyln

README.md

@@ -1,17 +1,19 @@
 # go-open-soql-visualizer
 SOQL query visualizer powered by [go-open-soql-parser](https://github.com/shellyln/go-open-soql-parser) and Mermaid.
 
-
 [![Test](https://github.com/shellyln/go-open-soql-visualizer/actions/workflows/test.yml/badge.svg)](https://github.com/shellyln/go-open-soql-visualizer/actions/workflows/test.yml)
 [![release](https://img.shields.io/github/v/release/shellyln/go-open-soql-visualizer)](https://github.com/shellyln/go-open-soql-visualizer/releases)
 [![Go version](https://img.shields.io/github/go-mod/go-version/shellyln/go-open-soql-visualizer)](https://github.com/shellyln/go-open-soql-visualizer)
 
 <img src="https://raw.githubusercontent.com/shellyln/go-open-soql-parser/master/_assets/logo-opensoql.svg" alt="logo" style="width:250px;" width="250">
 
-## 🧭 Demo
+---
 
+## 🧭 Demo
 * [SOQL query visualizer](https://shellyln.github.io/soql-visualizer/)
 
+![visualizer-01](./_assets/visualizer-01.png)
+
 ## ⚖️ License
 
 MIT