Add a frequently asked questions section to the docs.

Author: HexDecimal

docs/faq.rst

@@ -0,0 +1,10 @@
+Frequently Asked Questions
+==========================
+
+How do you set a frames-per-second while using contexts?
+--------------------------------------------------------
+
+You'll need to use an external tool to manage the framerate.
+This can either be your own custom tool or you can copy the Clock class from the
+`framerate.py <https://github.com/libtcod/python-tcod/blob/develop/examples/framerate.py>`_
+example.

docs/index.rst

@@ -17,11 +17,8 @@ Contents:
 
     installation
     glossary
-
-.. toctree::
-    :maxdepth: 1
-
     changelog
+    faq
 
 .. toctree::
     :maxdepth: 2