[staging/AArch64StandaloneMm] Branch to implement MM in Standalone Mode on AArch64

[<achin.gupta@arm.com>]

From: Achin Gupta <achin.gupta@arm.com>

This patch captures a brief description of the intent behind the
'AArch64StandaloneMm' branch in the Readme.MD file.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Achin Gupta <achin.gupta@arm.com>
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+This branch will be used to contribute support for Standalone MM on ARMv8-A platforms in the AArch64 execution state.
+
+The branch owner: Achin Gupta <achin.gupta@arm.com>
+
+# Feature Introduction
+The "Volume 4: Platform Initialization Specification, Management Mode Core
+Interface" introduces the concept of MM Standalone Mode. Initialization of MM in
+this mode can be done during the SEC phase. On ARMv8-A systems, [ARM Trusted
+Firmware](https://github.com/ARM-software/arm-trusted-firmware) is responsible
+for launching the normal world firmware e.g. UEFI. It can be seen as running in
+the PI SEC phase. The aim of this branch is to add support in EDK2 for:
+
+1. Initialisation of the Standalone MM environment during the SEC phase in
+   collaboration with ARM Trusted Firmware
+2. Accessing MM services instantiated in the secure world from the normal world
+   i.e. UEFI, OS in collaboration with ARM Trusted Firmware.
+
+## Details
+The Standalone MM environment is instantiated in Secure EL0 and runs under
+control of ARM TF. This branch builds upon the StandaloneSmmPkg module
+originally contributed by Intel.
+
+* Platform: FVPv7.7 FVP_Base_AEMv8A-AEMv8A
+* Toolchain: aarch64-linux-gnu-gcc (Linaro GCC 2014.11) 4.9.3 20141031 (prerelease)
+
+####
+
+## Related Modules
+The following modules are related to Standalone MM:
+
+StandaloneSmmPkg - Standalone MM package. This package provides the MM Foundation, MM CPU driver and related libraries/modules required for instantiating a MM environment in the secure world
--
1.9.1

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