[staging/cadence-aarch64] Add readme for cadence-aarch64 branch

[Scott Telford <stelford@cadence.com>]

Announcing the creation of a new edk2-staging branch for Cadence peripheral
hardware support in AArch64 platforms.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Scott Telford <stelford@cadence.com>
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 Readme.MD | 27 +++++++++++++++++++++++++++
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 create mode 100644 Readme.MD

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+# Cadence IP Support Branch
+
+This branch will be used to contribute code to support Cadence
+hardware IP for AArch64-based platforms.
+
+## edk2-staging branch owners
+* Scott Telford <stelford@cadence.com>
+
+## Introduction 
+
+Cadence develops a variety of peripheral IP modules suitable for ARM
+SoC architectures. This branch is intended to provide a staging area
+for drivers and libraries developed to support Cadence peripherals
+that may be incorporated into various SoC architectures from other
+vendors, for later integration into the appropriate EDK2
+platforms. Initially, the focus will be support for the Cadence PCIe
+4.0 Root Port. For internal development and testing purposes, an EDK2
+platform has been developed for a minimal AArch64 system
+configuration, comprising a single Cortex-A53 processor, GIC-500,
+NIC-400, Cadence PCIe Root Port, and Cadence UART. This will be
+included in the branch to provide an example of driver/platform
+integration.
+
+## Related Modules
+The following modules are related to this branch:
+* CadencePkg   - Package containing Cadence-specific drivers and libraries
+* MdeModulePkg - Package containing generic drivers relevant to Cadence peripheral IP
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