Update README.md

README.md

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-peng3d_sphinxext
+# `peng3d_sphinxext` - A Sphinx plugin adding support for [peng3d](https://github.com/not-na/peng3d) events
+
+This Sphinx plugin adds support for [peng3d Events](http://peng3d.readthedocs.io/en/latest/events.html).
+It also supports old-style pyglet events sent via peng3d.
+
+## Short documentation
+
+There are only two directives added by `peng3d_sphinxext`:
+
+    .. peng3d:event:: some:event.name
+      
+        Documentation for the event.
+and
+
+    .. peng3d:pgevent:: on_pyglet_event
+        
+        Documentation for a pyglet event.
+
+These directives can be referred to as usual, via ``:peng3d:event:`some:event.name`` and ``:peng3d:pgevent:`on_pyglet_event` ``.