Fix documentation build

CHANGELOG.rst

@@ -2,7 +2,7 @@ Flat_Tree 0.0.1a3 (2019-07-01)
 ==============================
 
 Improved Documentation
---------
+----------------------
 
 - Use the sphinx_rtd_theme.
 - Attempt to clarify sections using better navigation.

documentation/source/example.rst

@@ -0,0 +1,24 @@
+*******
+Example
+*******
+
+You can represent a binary tree in a simple flat list using the following structure.
+
+.. code-block:: python
+
+    """
+
+         3
+     1       5
+   0   2   4   6  ...
+
+   """
+
+This module exposes a series of functions to help you build and maintain this data structure.
+
+.. code-block:: python
+
+    from flat_tree import FlatTreeAccessor
+
+    tree_access = FlatTreeAccessor()
+    tree_access.index(1, 0)  # get index @ depth: 1, offset: 0