Add documentation links to the README.
Add documentation links to the README.

jedisct1/rust-encoding,nox/rust-encoding,lifthrasiir/rust-encoding,jedisct1/rust-encoding,nox/rust-encoding,lifthrasiir/rust-encoding,tempbottle/rust-encoding,nox/rust-encoding,lifthrasiir/rust-encoding,tempbottle/rust-encoding,tempbottle/rust-encoding