Add module Doc comments.

hammond-data/src/feed.rs

@@ -1,3 +1,5 @@
+//! Index and retrieve Feeds.
+
 use rayon::prelude::*;
 use diesel::prelude::*;
 use rayon::iter::IntoParallelIterator;

hammond-data/src/lib.rs

@@ -2,6 +2,9 @@
 #![warn(missing_docs)]
 #![cfg_attr(feature = "cargo-clippy", allow(blacklisted_name))]
 
+//! A libraty for parsing, indexing and retrieving podcast Feeds,
+//! into and from a Database.
+
 #[macro_use]
 extern crate error_chain;
 

hammond-data/src/utils.rs

@@ -1,3 +1,5 @@
+//! Helper utilities for accomplishing various tasks.
+
 use rayon::prelude::*;
 use chrono::prelude::*;