update readme

Author: hpoul

README.md

@@ -6,6 +6,15 @@ Uses the pub [postgres](https://pub.dev/packages/postgres) package internally
 
 see [example/lib/main.dart](example/lib/main.dart).
 
+## Features
+
+It provides the following utilities.
+
+* Utilities for creating and dropping databases and tables.
+* Some very trivial Migration handling
+* Utility methods for common insert/update queries.
+* Easy transaction management.
+
 ## Examples
 
 Check out https://github.com/authpass/authpass-cloud for a project using this package.