Add 'ops/posix_mq.rs/' from commit 'f7d1a38da6'

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ops/posix_mq.rs/README.md

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+posix_mq
+========
+
+[![Build Status](https://travis-ci.org/aprilabank/posix_mq.rs.svg?branch=master)](https://travis-ci.org/aprilabank/posix_mq.rs)
+[![crates.io](https://img.shields.io/crates/v/posix_mq.svg)](https://crates.io/crates/posix_mq)
+
+This is a simple, relatively high-level library for the POSIX [message queue API][]. It wraps the lower-level API in a
+simpler interface with more robust error handling.
+
+Check out this project's [sister library][] in Kotlin.
+
+Usage example:
+
+```rust
+// Values that need to undergo validation are wrapped in safe types:
+let name = Name::new("/test-queue").unwrap();
+
+// Queue creation with system defaults is simple:
+let queue = Queue::open_or_create(name).expect("Opening queue failed");
+
+// Sending a message:
+let message = Message {
+  data: "test-message".as_bytes().to_vec(),
+  priority: 0,
+};
+queue.send(&message).expect("message sending failed");
+
+// ... and receiving it!
+let result = queue.receive().expect("message receiving failed");
+```
+
+[message queue API]: https://linux.die.net/man/7/mq_overview
+[sister library]: https://github.com/aprilabank/posix_mq.kt