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

pages/common/amass.md

@@ -0,0 +1,20 @@
+# amass
+
+> In-depth Attack Surface Mapping and Asset Discovery tool.
+> More information: <https://github.com/OWASP/Amass>.
+
+- Check the Amass version:
+
+`amass -version`
+
+- Show general help:
+
+`amass -help`
+
+- Show help on an Amass subcommand (like `intel`, `enum`, etc.):
+
+`amass -help {{subcommand}}`
+
+- Execute an Amass subcommand:
+
+`amass {{subcommand}}`