docs/infra: add a change-log document

Add a change log document to list the new features, important buf fixes,
improvements over previous releases, tests covered and other important
information for every release.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: Id52e6c44edf3f8cf2b04b67a1a112310c8b24dc4

docs/infra/change-log.rst

+Neoverse Reference Design Platform Software Releases
+====================================================
+
+.. contents::
+
+This document contains a summary of the new features, changes, fixes and known
+issues in each release of the Neoverse Reference Design (RD) platform software
+releases. The changes introduced with each of the release is listed under the
+the corresponding release tag. The release tag format is RD-INFRA-YYYY.MM.DD.
+
+
+RD-INFRA-2021.01.25
+-------------------
+- Rebase the RD-N2 platform software to latest upstream software.
+- Adds support for ACS compliance test for RD-N2 platform.
+- Adds support for UEFI secure boot on RD-N2 platform.
+- RD-N2 platform software stack validated for the following
+  - Busybox boot
+  - Fedora 32 server distribution installation and boot
+  - Ubuntu 20.04.1 server distribution installation and boot
+  - Debian 10.6 server distribution installation and boot
+  - UEFI Secure Boot
+  - WinPE boot
+  - ACS compliance test