README.rst: add Usage section and minor cleanup

Author: Sanqui

README.rst

@@ -3,7 +3,7 @@ python-ethtool
 
 *Python bindings for the ethtool kernel interface*
 
-**This is a new upstream for python-ethtool maintained by Fedora's
+**This is the new upstream for python-ethtool maintained by Fedora's
 Python SIG.**
 
 About
@@ -12,24 +12,35 @@ About
 Allows querying and changing of ethernet card settings, such as speed,
 port, autonegotiation, and PCI locations.
 
+Usage
+-----
+
+``pethtool`` mimics behavior of the ``ethtool`` utility, but does not
+support all options.
+
+e.g., to get driver information on the ``eth0`` interface::
+
+    $ pethtool -i eth0
+    driver: cdc_ether
+    bus-info: usb-0000:00:14.0-4.1.3
+
+Further usage information may be found in the ``pethtool(8)`` manpage.
+
 Authors
 -------
 
-Original authors
-~~~~~~~~~~~~~~~~
-
 * Harald Hoyer
 * Arnaldo Carvalho de Melo
 * David Sommerseth
 
 Current maintainers
-~~~~~~~~~~~~~~~~~~~
+-------------------
 
 * Lumír Balhar <lbalhar@redhat.com>
 * Miro Hrončok <mhroncok@redhat.com>
 * Charalampos Stratakis <cstratak@redhat.com>
 
-Contribution
+Contributing
 ------------
 
 Feel free to help us with improving test coverage, porting to Python 3