Update README.md

Author: GitTimeraider

README.md

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 A comprehensive web-based solution for backing up GitHub repositories with scheduling, multiple backup formats, and user management.
 
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+    <img width="100%" src="https://github.com/GitTimeraider/Assets/blob/main/GithubBackup-docker/img/dashboard3.jpg">
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 ## Features
 
 - **Web UI with Authentication**: Secure login system with automatic admin user creation