crond: add page (#16893)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/crond.md

@@ -0,0 +1,24 @@
+# crond
+
+> Daemon to execute scheduled commands from crontab files.
+> More information: <https://manned.org/crond>.
+
+- Start daemon in the background and check for scheduled commands:
+
+`crond`
+
+- Start daemon in the foreground and check for scheduled commands:
+
+`crond -n`
+
+- Send job output from the daemon to the system log:
+
+`crond -s`
+
+- Override default limitations and accept custom crontables:
+
+`crond -p`
+
+- Inherit crontab file path from environment settings:
+
+`crond -P`