Merge pull request #4 from paddy-exe/add-preview-image

Add GitHub Preview Image to README

Author: paddy-exe

README.md

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   </a>
 </div>
 
+![ShaderFunctions-GitHub-Preview](https://user-images.githubusercontent.com/38077837/223874483-03c037d6-d27f-4e83-a5b1-2d4af3c991fb.png)
+
+
 This project aims to help Godot developers writing custom written shaders by providing high-level functions which are often used.
 
 ## :tada: Using the addon