clamscan: add page (#2815)

pages/common/clamscan.md

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+# clamscan
+
+> A command line virus scanner.
+> Homepage: <https://www.clamav.net>.
+
+- Scan a file for vulnerabilities:
+
+`clamscan {{path/to/file}}`
+
+- Scan all files recursively in a specific directory:
+
+`clamscan -r {{path/to/directory}}`
+
+- Scan data from stdin:
+
+`{{command}} | clamscan -`
+
+- Specify a virus database file or directory of files:
+
+`clamscan --database {{path/to/database_file_or_directory}}`
+
+- Scan the current directory and output only infected files:
+
+`clamscan --infected`
+
+- Output the scan report to a log file:
+
+`clamscan --log {{path/to/log_file}}`
+
+- Move infected files to a specific directory:
+
+`clamscan --move {{path/to/quarantine_directory}}`
+
+- Remove infected files:
+
+`clamscan --remove yes`