chg: usr: flesh out SDD starter with DID sections, add example rst hdrs

Signed-off-by: Stephen L Arnold <sarnold@vctlabs.com>

Author: sarnold

resources/header-levels.rst

@@ -0,0 +1,31 @@
+==============
+ Title header
+==============
+
+
+Level 1
+=======
+
+
+Level 2
+#######
+
+
+Level 3
+-------
+
+
+Level 4
+~~~~~~~
+
+
+Level 5
++++++++
+
+
+Level 6
+^^^^^^^
+
+
+Level 7
+*******