Restructure repository: Remove OWASP categorization, organize by vulnerability type

Co-authored-by: Stalin-143 <161853795+Stalin-143@users.noreply.github.com>

Open-Redirect/README.md

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+# Open Redirect
+
+## Description
+Open redirect vulnerabilities occur when a web application accepts user-controlled input that specifies a link to an external site and uses that link in a redirect. This can be used for phishing attacks or to bypass security controls.
+
+## Common Attack Vectors
+- URL parameters (redirect, url, return, next)
+- Login/logout redirect parameters
+- OAuth callback URLs
+- Error page redirects
+
+## Testing Approach
+Submit external URLs in redirect parameters to test if the application redirects to arbitrary external sites.
+
+## Payloads
+See `open-redirect-payloads.txt` for a comprehensive list of open redirect payloads.