ssh-keyscan: add page

pages/common/ssh-keyscan.md

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+# ssh-keyscan
+
+> Get the public ssh keys of remote hosts.
+
+- Retrieve all public ssh keys of a remote host:
+
+`ssh-keyscan {{host}}`
+
+- Retrieve all public ssh keys of a remote host listening on a specific port:
+
+`ssh-keyscan -p {{port}} {{host}}`
+
+- Retrieve certain types of public ssh keys of a remote host:
+
+`ssh-keyscan -t rsa,dsa,ecdsa,ed25519 {{host}}`