Added document for tree command

[akramkazmi71]

For the issue 711, added a new document for tree command.

[akramkazmi71]

@andrasio can you please help me, how can I resolve these errors?

[sophiajt]

You can ignore the CI error. I just fixed that this morning.

For your example, can you use a small example? This one is quite big.

[sophiajt]

Also, it looks like you're documenting the tree command from outside of Nushell? Nushell has its own tree command that will display the table as a tree.

If you build with cargo build --all-features you'll see the tree command when you run help tree inside of Nushell.

[andrasio]

@akramkazmi71 Please read again the instructions for writing documentation carefully. This is no the tree Nu command. Closing this for now, feel free to make changes required and reopen!

Thanks!