fixup! Add first cut of git-credential-fdoss

Explain what SecretService implements and why a bit better.

Addresses: #3 (comment)

dbus.go

@@ -8,8 +8,9 @@ import (
 )
 
 // SecretService implements a client of the freedesktop.org DBus [Secret
-// Service Specification] as needed for git-credential-fdoss to do what it
-// needs to do. It is not a full implementation of the API.
+// Service Specification] implementing only the functionality needed for an
+// implementation of a git credential helper. It is not a full client
+// implementation of the API.
 //
 // It supports adding secrets, looking them up and deleting them, mapping to
 // the "store", "get" and "erase" commands of the git-credential protocol.