Fix spelling and images size.

Change-Id: I01c6342fa9f6b16753ed5f48645538e48af09a5a
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

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+Application framework
+=====================
+
+Foreword
+--------
+
+This document describes application framework fundamentals.
+FCS (Fully Conform to Specification) implementation is still under development.
+It may happen that current implementation somehow diverges with specifications.
+
+Overview
+--------
+
+The application framework on top of the security framework
+provides components to install and uninstall applications
+as well as to run them in a secured environment.
+
+The goal of the framework is to manage applications and hide security details
+to applications.
+
+For the reasons explained in introduction, it was choose not to reuse Tizen
+application framework directly, but to rework a new framework inspired from Tizen.
+
+fundamentals remain identical: the applications are distributed
+in a digitally signed container that should match widget specifications
+normalized by the W3C. This is described by the technical
+recommendations [Packaged Web Apps (Widgets)](http://www.w3.org/TR/widgets) and [XML Digital Signatures for Widgets](http://www.w3.org/TR/widgets-digsig) of the W3 consortium.
+
+As today this model allows the distribution of HTML, QML and binary applications
+but it could be extended to any other class of applications.
+
+The management of widget package signatures.
+Current model is only an initial step, it might be extended in the
+future to include new feature (ie: incremental delivery).