Add tree command to user space

[suhani-arora]

Tree command: displays the directory structure of the file system in a hierarchical format.

Plan:
Recursively list directories and subdirectories in an indented tree format, showing all files and folders.
It also summarizes the total number of directories and files at the end.

Add flags:
‘-L ’ to limit the depth of the tree
‘-F ’ to filter for specific file types like .txt, .s, .c, .h
‘-S’ to show the size of each file
‘-D ’ to filter files by the created or modified date

Files to be added/modified:
Create user/tree.c, including the main implementation of tree command with additional utilities.
Modify user/Makefile to include tree.c
Modify kernel/syscall.h to ensure any new system calls are defined here
Modify kernel/syscall.c to add entries to the system call table (if any new syscalls are required for retrieving file information)
Modify user/user.h to add new function prototypes for syscalls/utility functions used by tree

Team: Chandana Srinivas, Suhani Arora, Riya Mathur

[malensek]

👍 I like it.