Add StackScan to Domains

README.md

@@ -288,6 +288,7 @@ A curated list of awesome search engines useful during Penetration testing, Vuln
 - [DomScan](https://domscan.net/tools/security) - Domain intelligence and attack-surface checks across DNS, WHOIS/RDAP, TLS, subdomains, reputation, and typosquatting
 - [CC.LA](https://cc.la) - Free online toolkit for WHOIS, RDAP, DNS, IP WHOIS, SSL certificates, name server history, and network diagnostics (ping/traceroute/MTR)
 - [ctr.name](https://crt.name/) - Give it an apex domain and you get every subdomain on file
+- [StackScan](https://www.stackscan.com/) - Search sites by technology, keyword, or the files and assets they serve
 
 ### URLs