Update README.md

Author: ShubhamJagtap2000

README.md

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 - [backslash-powered-scanner](https://github.com/PortSwigger/backslash-powered-scanner) - Finds unknown classes of injection vulnerabilities
 - [Eagle](https://github.com/BitTheByte/Eagle) - Multithreaded Plugin based vulnerability scanner for mass detection of web-based applications vulnerabilities
 - [cariddi](https://github.com/edoardottt/cariddi) - Take a list of domains, crawl urls and scan for endpoints, secrets, api keys, file extensions, tokens and more... 
+- [OWASP ZAP](https://github.com/zaproxy/zaproxy) -  World’s most popular free web security tools and is actively maintained by a dedicated international team of volunteers
 
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