Add some basic docs

src/bytes.rs

@@ -1,3 +1,5 @@
+//! Helper module to enable serializing bytes more efficiently
+
 use std::ops;
 
 use ser;

src/de/mod.rs

@@ -1,3 +1,5 @@
+//! Generic deserialization framework.
+
 use std::str;
 
 pub mod impls;

src/lib.rs

@@ -1,3 +1,11 @@
+//! Serde Serialization Framework
+//!
+//! Serde is a powerful framework that enables serialization libraries to generically serialize
+//! Rust data structures without the overhead of runtime type information. In many situations, the
+//! handshake protocol between serializers and serializees can be completely optimized away,
+//! leaving serde to perform roughly the same speed as a hand written serializer for a specific
+//! type.
+
 #![feature(collections, convert, core, std_misc, unicode)]
 
 extern crate unicode;

src/ser/mod.rs

@@ -1,3 +1,5 @@
+//! Generic serialization framework.
+
 use std::str;
 
 pub mod impls;