add README.rst with basic usage and installation instructions

Author: Cosimo Lupo

README.rst

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+|Travis Build Status| |PyPI Version| |Python Versions|
+
+
+UFO Extractor
+=============
+
+Tools for extracting data from font binaries into UFO objects.
+
+Features
+--------
+
+Import data into a `Defcon <https://github.com/typesupply/defcon>`__ ``Font``
+instance:
+
+.. code:: python
+
+   >>> import extractor
+   >>> import defcon
+   >>> ufo = defcon.Font()
+   >>> extractor.extractUFO("/path/to/MyFont.ttf", ufo)
+   >>> ufo.save("/path/to/MyFont.ufo")
+
+Supported input formats:
+
+-  CFF or TrueType-flavored OpenType fonts (``*.otf``, ``*.ttf``)
+-  `FontTools <https://github.com/fonttools/fonttools>`__ TTX files
+   (``*.ttx``)
+-  WOFF 1.0/2.0 (``*.woff``, ``*.woff2``)
+-  PostScript Type1 fonts (``*.pfa``, ``*.pfb``, etc.)
+
+Installation
+------------
+
+You can install ``extractor`` with ``pip``:
+
+.. code::
+
+   $ pip install ufo-extractor
+
+Note that, for historical reasons, the package is listed on the
+`Python Package Index <https://travis-ci.org/typesupply/extractor>`__ under the name
+``ufo-extractor``, to disambiguate it from another package also called "extractor".
+However, the import name for the package remains ``extractor``, without prefix.
+
+
+.. |Travis Build Status| image:: https://travis-ci.org/typesupply/extractor.svg?branch=master
+   :target: https://travis-ci.org/typesupply/extractor
+.. |PyPI Version| image:: https://img.shields.io/pypi/v/ufo-extractor.svg
+   :target: https://pypi.org/project/ufo-extractor/
+.. |Python Versions| image:: https://img.shields.io/badge/python-2.7%2C%203.5-blue.svg