Add readme and GO!

pve-edk2-firmware/readme.md

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+# This is prebuild edk2 firmware
+
+## 1. Build RISCV64 
+https://github-wiki-see.page/m/riscv-non-isa/riscv-acpi/wiki/PoC-%3A-How-to-build-and-test-ACPI-enabled-kernel
+
+###  a. Clone source code
+```bash
+git clone --branch riscv_acpi https://github.com/ventanamicro/opensbi.git opensbi
+git clone --recurse-submodule git@github.com:tianocore/edk2.git edk2
+```
+###  b. Build edk2
+```bash
+export WORKSPACE=`pwd`
+export GCC5_RISCV64_PREFIX=/usr/bin/riscv64-linux-gnu-
+export PACKAGES_PATH=$WORKSPACE/edk2
+export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
+source edk2/edksetup.sh
+make -C edk2/BaseTools clean
+make -C edk2/BaseTools
+make -C edk2/BaseTools/Source/C
+source edk2/edksetup.sh BaseTools
+build -a RISCV64 --buildtarget RELEASE -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t GCC5
+truncate -s 32M Build/RiscVVirtQemu/RELEASE_GCC5/FV/RISCV_VIRT.fd
+```
+edk2 firmware will be located at `Build/RiscVVirtQemu/RELEASE_GCC5/FV/RISCV_VIRT.fd`
+
+### c. Build OpenSBI
+
+```bash
+cd opensbi
+make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- PLATFORM=generic
+```
+sbifw located at `opensbi/build/platform/generic/firmware/fw_dynamic.bin`
+
+## 2. Build Loongarch64
+https://mirrors.pku.edu.cn/loongarch/archlinux/images/README.html