Add documentation skeleton.

Add licensing information and minimal documentation.

Change-Id: I5dea9192634980eda0e3518b1bff7cea85a9ab91
Signed-off-by: Gyorgy Szing <gyorgy.szing@arm.com>
diff --git a/docs/index.rst b/docs/index.rst
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+Trusted Services Documentation
+==============================
+The Trusted Services project provides a framework for developing and deploying device
+root-of-trust services across a range of secure processing environments such as those
+provided by OP-TEE and Hafnium.
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Contents:
+   :hidden:
+
+   project/license
+   project/maintainers
+
+--------------
+
+*Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause