DOC: update documentation.

Add documentation covering:
  - developer information about architecture
  - project structure and building
  - project overview and service descriptions
  - the portability model for supporting hardware

Signed-off-by: Julian Hall <julian.hall@arm.com>
Co-Authored-By: Gyorgy Szing <gyorgy.szing@gmail.com>
Change-Id: I8bf9c01a66350719d82a7ca2bc1c78a8ab17978d
diff --git a/docs/project/license.rst b/docs/project/license.rst
index 472bc6a..fb63be6 100644
--- a/docs/project/license.rst
+++ b/docs/project/license.rst
@@ -1,7 +1,7 @@
 License
 =======
 
-Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
@@ -11,7 +11,7 @@
 -  Redistributions in binary form must reproduce the above copyright notice, this
    list of conditions and the following disclaimer in the documentation and/or
    other materials provided with the distribution.
--  Neither the name of ARM nor the names of its contributors may be used to
+-  Neither the name of Arm nor the names of its contributors may be used to
    endorse or promote products derived from this software without specific prior
    written permission.