Update README.md

Author: 1001binary

README.md

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 # Recaptcha-mvc
 The .NET library for integrating Google Recaptcha V3 into ASP.NET MVC 3 and higher.
 
+<div style="text-align:center">
 ![Google Recaptcha V3](https://www.google.com/recaptcha/intro/images/hero-recaptcha-invisible.gif)
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+</div>
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 ### Usage
 
 - Suppose you have a ASP.NET MVC project.