(use "git reset HEAD <file>..." to unstage)

	modified:   .gitignore
	modified:   Makefile
	modified:   commands.c
	modified:   commands.h
	modified:   simfs
	modified:   simfs.c

Add more commands:
tree
rmdir
Enhance some commands:
mkdir can create folder with subfolders: mkdir abc/123/xyz
sub directory can be as many as 1024+12