medusa: add page (#3899)

pages/linux/medusa.md

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+# Medusa
+
+> A modular and parallel login brute-forcer for a variety of protocols.
+
+- Execute brute force against an FTP server using a file containing usernames and a file containing passwords:
+
+`medusa -M ftp -h host -U {{path/to/username_file}} -P {{path/to/password_file}}`
+
+- Execute a login attempt against a HTTP server using the username, password and user-agent specified:
+
+`medusa -M HTTP -h host -u {{username}} -p {{password}} -m USER-AGENT:"{{Agent}}"`
+
+- Execute a brute force against a MySQL server using a file cointaining usernames and a hash:
+
+`medusa -M mysql -h host -U {{path/to/username_file}} -p {{hash}} -m PASS:HASH`
+
+- Execute a brute force against a list of SMB servers using a username and a pwdump file:
+
+`medusa -M smbnt -H {{path/to/hosts_file}} -C {{path/to/pwdump_file}} -u {{username}} -m PASS:HASH`