A first iteration of the usage documentation.

docs/docs/usage.rst

@@ -0,0 +1,33 @@
+.. include:: ../global.rst
+
+Usage
+=====
+
+|parso| works around grammars. You can simply create Python grammars by calling
+``load_grammar``. Grammars (with a custom tokenizer and custom parser trees)
+can also be created by directly instantiating ``Grammar``. More information
+about the resulting objects can be found in the :ref:`parser tree documentation
+<plugin-api-classes>`.
+
+.. automodule:: parso.grammar
+    :members:
+    :undoc-members:
+
+
+Utility
+-------
+
+.. autofunction:: parso.parse
+
+.. automodule:: parso.utils
+    :members:
+    :undoc-members:
+
+
+Used By
+-------
+
+- jedi_ (which is used by IPython and a lot of plugins).
+
+
+.. _jedi: https://github.com/davidhalter/jedi