Add legal and skeleton documentation files.

Change-Id: I40c982c165881593d88215913309e3177436da1c
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
diff --git a/doc/contributing.rst b/doc/contributing.rst
new file mode 100644
index 0000000..9993d84
--- /dev/null
+++ b/doc/contributing.rst
@@ -0,0 +1,15 @@
+Contributing

+============

+

+TODO: add info here about:

+  * DCO and commit message format

+  * tf.org repo loc and how to set up loal repo

+  * link to coding style

+  * link to sw requirements

+  * link to build instructions

+

+--------------

+

+*Copyright (c) 2019, Arm Limited and Contributors. All rights reserved.*

+

+SPDX-License-Identifier: BSD-3-Clause