docs: Add argos in readme

README.md

@@ -35,7 +35,7 @@ Try Live Editor previews of future releases: <a href="https://develop.git.mermai
 [![NPM Downloads](https://img.shields.io/npm/dm/mermaid)](https://www.npmjs.com/package/mermaid)
 [![Join our Discord!](https://img.shields.io/static/v1?message=join%20chat&color=9cf&logo=discord&label=discord)](https://discord.gg/AgrbSrBer3)
 [![Twitter Follow](https://img.shields.io/badge/Social-mermaidjs__-blue?style=social&logo=X)](https://twitter.com/mermaidjs_)
-[![Covered by Argos Visual Testing](https://argos-ci.com/badge.svg)](https://argos-ci.com)
+[![Covered by Argos Visual Testing](https://argos-ci.com/badge.svg)](https://argos-ci.com?utm_source=mermaid&utm_campaign=oss)
 
 <img src="./img/header.png" alt="" />
 
@@ -82,6 +82,10 @@ You can also use Mermaid within [GitHub](https://github.blog/2022-02-14-include-
 
 For a more detailed introduction to Mermaid and some of its more basic uses, look to the [Beginner's Guide](https://mermaid.js.org/intro/getting-started.html), [Usage](https://mermaid.js.org/config/usage.html) and [Tutorials](https://mermaid.js.org/ecosystem/tutorials.html).
 
+Our PR Visual Regression Testing is powered by [Argos](https://argos-ci.com/?utm_source=mermaid&utm_campaign=oss) with their generous Open Source plan. It makes the process of reviewing PRs with visual changes a breeze.
+
+[![Covered by Argos Visual Testing](https://argos-ci.com/badge-large.svg)](https://argos-ci.com?utm_source=mermaid&utm_campaign=oss)
+
 In our release process we rely heavily on visual regression tests using [applitools](https://applitools.com/). Applitools is a great service which has been easy to use and integrate with our tests.
 
 <a href="https://applitools.com/">