Update README.md

Author: EduardoPires

README.md

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 <img src="https://repository-images.githubusercontent.com/268701472/8bf84980-a6ce-11ea-83da-e2133c5a3a7a" alt=".NET DevPack" width="300px" />
 
 What is the .NET DevPack.Identity?
 =====================
 .NET DevPack Identity is a set of common implementations to help you implementing ASP.NET Identity, JWT, claims validation and another facilities
 
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