Update README.md

Author: 1001binary

README.md

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-# recaptcha-mvc
+# Recaptcha-mvc
 The .NET library for integrating Google Recaptcha V3 into ASP.NET MVC 3 or higher.
+
+### Usage
+
+- Suppose you have a ASP.NET MVC project.
+- Go to Google Recaptcha V3 to get client key and secret key.
+- Install RecaptchaMvc.NET via Nuget.
+- Download the sample project from this repository.
+- Follow it to integrate Google Recaptcha V3 into your web application.
+
+### Copyright and License
+©Copyright 2020 by 1001binary
+MIT License