Improve README.md

Author: pentest-gg

README.md

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+<p align="center">
+  <kbd><img src="https://raw.githubusercontent.com/AppSolves/fastapi-users-db-dynamodb/refs/heads/main/assets/github/repo_card.png?sanitize=true" alt="FastAPI Users DynamoDB Adapter"></kbd>
+</p>
+<br>
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 # FastAPI Users - Database adapter for AWS DynamoDB
 
 <p align="center">