[Docs] Add Scaffolding for Gramine to documentation

Signed-off-by: Mariusz Zaborski <oshogbo@invisiblethingslab.com>

Documentation/index.rst

@@ -65,6 +65,13 @@ The following steps can be performed to protect your application with Gramine:
 
 You can also check :doc:`Gramine tutorials<tutorials-index>`.
 
+As a simplified way of protecting your application against malicious hosts you
+can use Scaffolding for Gramine (SCAG). It is a tool which transforms your
+application into a graminized Docker image, encapsulating both your application
+and the Gramine Library OS. It offers seamless support for a variety of
+frameworks, including but not limited to Flask and Express.js. For a more
+in-depth exploration, see :doc:`scag-installation`.
+
 Configure Gramine
 -----------------
 
@@ -173,6 +180,7 @@ Indices and tables
    installation
    run-sample-application
    tutorials-index
+   scag-installation
 
 .. toctree::
    :hidden:

Documentation/scag-installation.rst

@@ -0,0 +1,34 @@
+Scaffolding for Gramine
+=======================
+
+The Scaffolding for Gramine (SCAG) tool transforms your application
+into a graminized Docker image, encapsulating both your application and
+the Gramine Library OS. The primary objective of the Scaffolding project
+is to simplify the process of safeguarding applications against malicious
+hosts.
+
+Setting itself apart from alternative solutions (like GSC), SCAG doesn't
+transform a Docker image, instead it generates a whole Docker image from
+the given projects. During the build process the required Dockerfile,
+manifest file, and other required configuration files are generated
+automatically for the user. A list of currently supported frameworks
+can be found in
+`documentation <https://gramine-scaffolding.readthedocs.io/en/latest/manpages/scag-setup.html#cmdoption-scag-setup-framework>`__
+.
+
+To speed up the process, SCAG offers a single command - ``scag-quickstart``.
+This tool also guides user interactively through the entire process of
+"graminizing" the application, from setting up the project to building it,
+and finally running it. For more advanced usage of SCAG, users are encouraged
+to refer to the documentation.
+
+SCAG wraps the application with additional security measures, such as adding
+SSL/TLS to plaintext-networking apps. All web-based frameworks, such as
+Express.js and Flask, are preconfigured to operate behind
+a web server (Nginx), with SSL/TLS and the RA-TLS extension.
+
+Note that the SCAG tool is standalone and not part of core Gramine, and is
+hosted here:
+
+- https://github.com/intel/ScaffoldingForGramine -- GitHub repository,
+- https://gramine-scaffolding.readthedocs.io/en/latest/ -- documentation.