Adds README for rustify_derive

Author: jmgilman

rustify_derive/README.md

@@ -0,0 +1,5 @@
+Provides a derive macro for easily implementing an `Endpoint` from the
+[rustify][1] crate. See the documentation for `rustify` for details on how
+to use this macro.
+
+[1]: https://docs.rs/rustify/

rustify_derive/src/lib.rs

@@ -267,7 +267,7 @@ fn endpoint_derive(s: synstructure::Structure) -> proc_macro2::TokenStream {
     // Generate query function
     let query = gen_query(&field_attrs);
 
-    // Gather data
+    // Generate data
     let data = match gen_data(&field_attrs) {
         Ok(v) => v,
         Err(e) => return e.into_tokens(),