Busybox Image

[fatmaebrahim]

This PR represents a script that builds a minimal Linux-based OS using the Linux kernel and busy-box
The script automates the process of:

• downloading the Linux kernel and compiling it
• downloading busybox, compiling it and add sym-links of all its tools inside the bin directory
• creating rootfs directories such as bin, dev, proc and sys
• creating an init script to mount the directories of the rootfs
• building initrd.img that holds the busybox binary and rootfs
• running the created image using qemu