Restructure repository: Remove OWASP categorization, organize by vulnerability type

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

XSS/README.md

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+# Cross-Site Scripting (XSS)
+
+## Description
+Cross-Site Scripting (XSS) attacks are a type of injection in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user.
+
+## Types of XSS
+- **Reflected XSS**: Script is reflected off the web server
+- **Stored XSS**: Script is permanently stored on the target server
+- **DOM-based XSS**: Vulnerability exists in client-side code
+
+## Common Attack Vectors
+- Input fields
+- URL parameters
+- HTTP headers
+- File uploads
+- Comment sections
+
+## Testing Approach
+Submit JavaScript code in various input points and observe if the code gets executed in the browser.
+
+## Payloads
+See `xss-payloads.txt` for a comprehensive list of XSS payloads.