start to say what a ZingoAccount is.. though, I'm not clear

Author: zancas

zingo-account/src/lib.rs

@@ -1,6 +1,9 @@
 //! A micro crate to provide a wrapper around the zcash_client_backend account trait.
 //! By constraining the wrapper to be independent of internal zingolib functionality
 //! we expose a shareable component, and refine the definition of zingolib.
+
+/// The a view-only abstraction that provides a management interface for
+/// TODO:  Explain more about our Account abstraction.
 pub struct ZingoAccount(
     pub zip32::AccountId,
     pub zcash_keys::keys::UnifiedFullViewingKey,