amass, httprobe, sublist3r, theHarvester: add page (#4912)

pages/common/amass-intel.md

@@ -0,0 +1,28 @@
+# amass intel
+
+> Collect open source intel on an organisation like root domains and ASNs.
+> More information: <https://github.com/OWASP/Amass/blob/master/doc/user_guide.md#the-intel-subcommand>.
+
+- Find root domains in an IP address range:
+
+`amass intel -addr {{192.168.0.1-254}}`
+
+- Use active recon methods:
+
+`amass intel -active -addr {{192.168.0.1-254}}`
+
+- Find root domains related to a domain:
+
+`amass intel -whois -d {{domain_name}}`
+
+- Find ASNs belonging to an organisation:
+
+`amass intel -org {{organisation_name}}`
+
+- Find root domains belonging to a given Autonomous System Number:
+
+`amass intel -asn {{asn}}`
+
+- Save results to a text file:
+
+`amass intel -o {{output_file}} -whois -d {{domain_name}}`