zmap: add page (#16056)

* Create zmap.md

* Update zmap.md

* Update pages/common/zmap.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update zmap.md

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/zmap.md

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+# zmap
+
+> Fast, open-source network scanner for Internet-wide surveys.
+> More information: <https://github.com/zmap/zmap>.
+
+- Scan a subnet or full IPv4 space for a specific TCP port (default: 80):
+
+`zmap {{SUBNETS}} -p {{port}}`
+
+- Scan specific ports or port ranges across a subnet:
+
+`zmap {{--target-ports}} {{port1,port2-port3,...}} {{SUBNETS}}`
+
+- Output results to a CSV file with custom fields:
+
+`zmap {{[-o|--output-file]}} {{path/to/output_file.csv}} {{[-f|--output-fields]}} "{{saddr,daddr,sport,dport}}" {{SUBNETS}}`
+
+- Limit the scan rate to a specific number of packets per second:
+
+`zmap {{[-r|--rate]}} {{packets_per_second}} {{SUBNETS}}`
+
+- Perform a dry run without sending packets:
+
+`zmap {{[-d|--dryrun]}} {{SUBNETS}}`
+
+- Exclude subnets using a blocklist file in CIDR notation:
+
+`zmap {{[-b|--blocklist-file]}} {{path/to/blocklist.txt}} {{SUBNETS}}`
+
+- Set a specific source IP for scan packets:
+
+`zmap {{[-S|--source-ip]}} {{source_ip}} {{SUBNETS}}`
+
+- Cap the number/percentage of targets to probe (e.g. 1000 IP/port pairs):
+
+`zmap {{[-n|--max-targets]}} {{1000}} {{SUBNETS}} {{[-p|--target-ports]}} {{port1,port2-port3}}`