Add 'ops/mq_cli/' from commit 'df29b08bff'

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ops/mq_cli/README.md

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+mq-cli
+======
+
+This project provides a very simple CLI interface to [POSIX message queues][].
+
+It can be used to create and inspect queues, as well as send and
+receive messages from them.
+
+```
+1.0.0
+Administrate and inspect POSIX message queues
+
+USAGE:
+    mq <SUBCOMMAND>
+
+FLAGS:
+    -h, --help       Prints help information
+    -V, --version    Prints version information
+
+SUBCOMMANDS:
+    create     Create a new queue
+    help       Prints this message or the help of the given subcommand(s)
+    inspect    inspect details about a queue
+    ls         list message queues
+    receive    Receive a message from a queue
+    rlimit     Get the message queue rlimit
+    send       Send a message to a queue
+```
+
+
+[POSIX message queues]: https://linux.die.net/man/7/mq_overview