Improve readme (#190)

* Elaborate on features in README

* Typo

README.md

@@ -4,8 +4,12 @@
 ![lint](https://github.com/cyralinc/approzium/workflows/lint/badge.svg)
 [![Documentation Status](https://readthedocs.org/projects/approzium/badge/?version=latest)](http://approzium.readthedocs.io/?badge=latest)
 
-Approzium provides SDKs that allow you to authenticate to a database without ever having access to its password. Your
-identity is provided through the platform on which you're running.
+Approzium is a tool that provides:
+- Password-less database authentication
+- Authentication through your cloud-provider's built-in identity
+- Highly security-oriented logging and metrics
+
+Its aim is to prevent data breaches, and to help you detect them promptly if they do occur or are attempted.
 
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