beanstalkd: add page (#1993)

pages/common/beanstalkd.md

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+# beanstalkd
+
+> A simple and generic work-queue server.
+
+- Start beanstalkd, listening on port 11300:
+
+`beanstalkd`
+
+- Start beanstalkd listening on a custom port and address:
+
+`beanstalkd -l {{ip_address}} -p {{port_number}}`
+
+- Persist work queues by saving them to disk:
+
+`beanstalkd -b {{path/to/persistence_directory}}`
+
+- Sync to the persistence directory every 500 milliseconds:
+
+`beanstalkd -b {{path/to/persistence_directory}} -f {{500}}`