doc: Start improving our pytest documentation

Begin the work of documenting all of our pytests. To do this, we should
have a directory under develop for it as there will be a large number of
new files. As the current document is referenced externally in a number
of locations, add the sphinx_reredirects module so that we can redirect
from the old location to the new.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/pytest/index.rst b/doc/develop/pytest/index.rst
new file mode 100644
index 0000000..435d84f
--- /dev/null
+++ b/doc/develop/pytest/index.rst
@@ -0,0 +1,12 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+pytest Framework within U-Boot
+==============================
+
+General
+-------
+
+.. toctree::
+   :maxdepth: 1
+
+   usage