Introduction information ReadTheDoc

Added introductory information on the AAF project

Change-Id: I80edbdbc2029f31a5e93925ac15fd3af6bbbb19b
Signed-off-by: Youssef-Chawki <youssef.chawki@orange.com>
Issue-ID: AAF-426
diff --git a/docs/sections/architecture/aaf_architecture.rst b/docs/sections/architecture/aaf_architecture.rst
index e806fb6..8681cf1 100644
--- a/docs/sections/architecture/aaf_architecture.rst
+++ b/docs/sections/architecture/aaf_architecture.rst
@@ -11,7 +11,7 @@
 
 |image0|
 
-.. |image0| image:: images/aaf-object-model.jpg
+.. |image0| image:: images/aaf-hl-object-model.png
    :height: 600px
    :width: 800px