Update readme file.

ChebanovDD · web-flow · commit 34c07d14f1b9 · 2023-05-23T17:16:36.000+08:00
diff --git a/README.md b/README.md
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 This package is part of [UnityMvvmToolkit](https://github.com/LibraStack/UnityMvvmToolkit).
 
+![unityuxmlgenerator-github-cover](https://github.com/LibraStack/UnityUxmlGenerator/assets/28132516/c8c1ee74-ee9f-4343-a859-b2eb05bd152f)
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 ## :open_book: Table of Contents
 
 - [About](#pencil-about)
