Add README.md

Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 license = "Apache-2.0 OR MIT"
 description = "Multiplexer over reliable, ordered connections"
 repository = "https://github.com/paritytech/yamux"
+readme = "README.md"
 
 [dependencies]
 bytes = "0.4"

README.md

@@ -0,0 +1,21 @@
+# Yamux
+
+A stream multiplexer over reliable, ordered connections such as TCP/IP.
+Implements https://github.com/hashicorp/yamux/blob/master/spec.md
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0
+   ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license
+   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.