Add additional metadata to Cargo.toml and README.md.

Author: 4lDO2

Cargo.toml

@@ -8,6 +8,8 @@ readme = "README.md"
 license = "MIT"
 repository = "https://github.com/4lDO2/tcp-channel"
 keywords = ["spsc", "channel"]
+documentation = "https://docs.rs/tcp-channel"
+categories = ["network-programming"]
 
 [dependencies]
 bincode = "1.1.2"

README.md

@@ -1,6 +1,8 @@
 # tcp-channel
 
+[![Crates.io](http://meritbadge.herokuapp.com/tcp-channel)](https://crates.io/crates/tcp-channel)
+[![Docs.rs](https://docs.rs/tcp-channel/badge.svg)](https://docs.rs/tcp-channel)
 [![Build Status](https://travis-ci.org/4lDO2/tcp-channel.svg?branch=master)](https://travis-ci.org/4lDO2/tcp-channel)
 
-SPSC channels in Rust, transmitted through anything that implements `Read`. 
+SPSC channels in Rust, transmitted through anything that implements `Read` and `Write`.
 It uses `bincode` and `serde` for serialization and deserialization.