sshd: add page (#6610)

pages/common/sshd.md

@@ -0,0 +1,21 @@
+# sshd
+
+> Secure Shell Daemon - allows remote machines to securely log in to the current machine.
+> Remote machines can execute commands as it is executed at this machine.
+> More information: <https://man.openbsd.org/sshd>.
+
+- Start daemon in the background:
+
+`sshd`
+
+- Run sshd in the foreground:
+
+`sshd -D`
+
+- Run with verbose output (for debugging):
+
+`sshd -D -d`
+
+- Run on a specific port:
+
+`sshd -p {{port}}`