Add permutation tools to README

Added new section for permutation tools with descriptions.

Author: Chirag8023

README.md

@@ -117,6 +117,7 @@
 - [retire.js](https://github.com/RetireJS/retire.js) - scanner detecting the use of JavaScript libraries with known vulnerabilities
 - [httpx](https://github.com/projectdiscovery/httpx) - httpx is a fast and multi-purpose HTTP toolkit allows to run multiple probers using retryablehttp library, it is designed to maintain the result reliability with increased threads.
 - [fingerprintx](https://github.com/praetorian-inc/fingerprintx) - fingerprintx is a standalone utility for service discovery on open ports that works well with other popular bug bounty command line tools.
+- [graphw00f](https://github.com/dolevf/graphw00f) - graphw00f is GraphQL Server Engine Fingerprinting utility for software security professionals looking to learn more about what technology is behind a given GraphQL endpoint.
 
 ### Content Discovery
 
@@ -488,6 +489,15 @@
 - [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
 - [SSTImap](https://github.com/vladko312/SSTImap) -  SSTImap is a penetration testing software that can check websites for Code Injection and Server-Side Template Injection vulnerabilities and exploit them, giving access to the operating system itself.
 
+### Permutation
+
+- [alterx](https://github.com/projectdiscovery/alterx) - Fast and customizable subdomain wordlist generator using DSL. alterx takes patterns as input and generates subdomain permutation wordlist based on that pattern.
+- [gotator](https://github.com/Josue87/gotator) - Gotator is a tool to generate DNS wordlists through permutations.
+- [ripgen](https://github.com/resyncgg/ripgen) - Rust-based high performance domain permutation generator.
+- [dnsgen](https://github.com/AlephNullSK/dnsgen) - DNSGen is a powerful and flexible DNS name permutation tool designed for security researchers and penetration testers. It generates intelligent domain name variations to assist in subdomain discovery and security assessments.
+- [goaltdns](https://github.com/subfinder/goaltdns) - A permutation generation tool written in golang.
+- [altdns](https://github.com/infosec-au/altdns) - Generates permutations, alterations and mutations of subdomains and then resolves them.
+
 ### Useful
 
 - [anew](https://github.com/tomnomnom/anew) -  A tool for adding new lines to files, skipping duplicates