update readme

Author: z3y

Docs~/public/shader-ball.jpg

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 # Graphlit
 
-Create Toon and PBR shaders without limits. Experience complete flexibility with shader features, use a variety of included nodes or create custom ones, and blend them however you like. Gain full control over your materials to achieve the exact look you want
+Create Toon and PBR shaders without limits. Use a variety of included nodes or create custom ones, and blend them however you like. Gain full control over your materials to achieve the exact look you want.
 
 ## Installation
 
@@ -20,6 +20,8 @@ Create Toon and PBR shaders without limits. Experience complete flexibility with
 
 ## Screenshots
 
+![Image](/Docs~/public/shader-ball.jpg)
+
 ![Image](/Docs~/public/Unity_iGcR8rpLM9.png)
 
 ### Live Preview