Add lession00 for Environment Setup. 1) arm-none-eabi toolchain installation 2) Build QEMU
Add lession00 for Environment Setup.
1) arm-none-eabi toolchain installation
2) Build QEMU

Signed-off-by: gogojesse <d0293af9fd4fede1de33f28b72cd4c4f871571fd@gmail.com>

gogojesse/simpleos