Link to the user's guide from the docs and manifest

Author: mbrubeck

Cargo.toml

@@ -13,6 +13,7 @@ name = "bindgen"
 readme = "README.md"
 repository = "https://github.com/rust-lang-nursery/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
+homepage = "https://rust-lang-nursery.github.io/rust-bindgen/"
 version = "0.36.0"
 build = "build.rs"
 

src/lib.rs

@@ -4,6 +4,9 @@
 //! functions and use types defined in the header.
 //!
 //! See the [`Builder`](./struct.Builder.html) struct for usage.
+//!
+//! See the [Users Guide](https://rust-lang-nursery.github.io/rust-bindgen/) for
+//! additional documentation.
 #![deny(missing_docs)]
 #![deny(warnings)]
 #![deny(unused_extern_crates)]