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

pages/common/amass-enum.md

@@ -0,0 +1,24 @@
+# amass enum
+
+> Find subdomains of a domain.
+> More information: <https://github.com/OWASP/Amass/blob/master/doc/user_guide.md#the-enum-subcommand>.
+
+- Passively find subdomains of a domain:
+
+`amass enum -passive -d {{domain_name}}`
+
+- Find subdomains of a domain and actively verify them attempting to resolve the found subdomains:
+
+`amass enum -active -d {{domain_name}} -p {{80,443,8080}}`
+
+- Do a brute force search for subdomains:
+
+`amass enum -brute -d {{domain_name}}`
+
+- Save the results to a text file:
+
+`amass enum -o {{output_file}} -d {{domain_name}}`
+
+- Save the results to a database:
+
+`amass enum -o {{output_file}} -dir {{path/to/database_directory}}`