Add OVMF firmware and VGA Bios suitable for use with Bochs

sdk/firmware/README.md

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+## Open Virtual Machine Firmware (OVMF)
+This directory contains the essential components of the Open Virtual Machine Firmware (OVMF), which provides
+an open-source implementation of the Unified Extensible Firmware Interface (UEFI) for virtual machines.
+
+The ovmf_code files contain the CPU architecture specific UEFI firmware code, which serves as the initial boot code
+for virtual machines used to test the XTOS. It includes the necessary instructions and functions to initialize hardware,
+load the operating system, and provide various system services during the boot process. The ovmf_code file is
+responsible for establishing a UEFI environment within the virtual machine, enabling it to boot and operate effectively.
+
+The ovmf_pure files contains the minimum version of the CPU specific UEFI firmware code, suitable for use with Bochs.
+
+The ovmf_vars files, store UEFI variables, which are used to store and retrieve system configuration information, such as
+boot options, device settings, and system preferences. The ovmf_vars file contains the persistent variables specific to
+a virtual machine, allowing it to maintain its configuration across multiple boot sessions.
+
+## Video BIOS (LGPL'd VGABios)
+The vgabios.bin file contains the Video Bios for Bochs and QEMU. This VGA Bios is very specific to the emulated VGA card.
+It is NOT meant to drive a physical vga card. It also implements support for VBE version 2.0.