infra/rdn2: add user-guide.rst for rdn2 platform

Add the initial user guide for the RD-N2 platform software stack. The
version of of the user guide points to documents that provide
information about obtain the platform software stack and using the
various features it provides. A table to list the release tags is
included as well.

Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>
Change-Id: I441744e6a8486fd5bdc30ba3d8b8c38eb6be1022

docs/infra/rdn2/user-guide.rst

+RD-N2 platform user guide
+=============================
+
+.. contents::
+
+
+Introduction
+------------
+
+RD (Reference Design) is a collection of resources to provide a representative
+view of typical compute subsystems that can be designed and implemented using
+specific generations of Arm IP.
+
+RD-N2 in particular is based on the following ARM IP's:
+
+- 32xMP1 Neoverse N2 CPUs
+
+- CMN-700 interconnect
+
+- Multiple AXI expansion ports for I/O Coherent PCIe, Ethernet, offload
+
+- Arm Cortex-M7 for System Control Processor (SCP) and
+  Manageability Control Processor (MCP)
+
+The Fixed Virtual Platform of RD-N2 config supports 16xMP1 Neoverse N2 CPUs.
+
+This document is a user guide on how to setup, build and run the RD-N2 software
+stack on the Fixed Virtual Platform.
+
+
+Setting up the Host Machine and Syncing the software stack
+-----------------------------------------------------------
+
+Host Machine requirements and the necessary steps to be followed to sync the
+software stack are listed on '`Download sources`_' page.
+
+
+Obtaining the RD-N2 Fast Model
+------------------------------
+
+The latest version of RD-N2 Fast Model can be requested by sending a email to
+Arm at this email address: `support-connect@arm.com <mailto:support-connect@arm.com>`_.
+
+Follow the instruction in the installer and setup the FVP. Typically, the
+installer will ask to create a new folder in the home directory. You can either
+install the FVP in the home folder, or in the ``fastmodel/refinfra`` folder
+inside the workspace. If you would like to install in the ``fastmodel/refinfra``
+folder, when asked for the install location, provide the absolute path of the
+``fastmodel/refinfra``.
+
+
+Supported Features on RD-N2 Fixed Virtual Platform
+--------------------------------------------------
+
+RD-N2 platform software stack supports the following features.
+
+- `Busybox Boot`_.
+- `Linux Distribution Boot`_.
+- `WinPE Boot`_.
+
+
+Release Tags
+------------
+
+Table below lists the release tags for the RD-N2 platform software stack and
+the corresponding RD-N2 FVP version that is recommended to be used along
+with the listed release tag.
+
++-----------------------+-------------------------+
+|     Release Tag       |    RD-N2 FVP Version    |
++=======================+=========================+
+|  RD-INFRA-2020.11.30  |       11.13.10          |
++-----------------------+-------------------------+
+
+
+--------------
+
+*Copyright (c) 2020, Arm Limited. All rights reserved.*
+
+
+.. _Busybox Boot: docs/infra/common/busybox-boot.rst
+.. _Linux Distribution Boot: docs/infra/common/distro-boot.rst
+.. _WinPE Boot: docs/infra/common/winpe-boot.rst
+.. _Download sources: docs/infra/common/download-sources.rst