Feature: Add support for NeoTree

[pysan3]

Thanks for your amazing plugin!

I see support for NvimTree but it would be very nice if you could support neo-tree as well.

The highlight group names can be found here:

https://github.com/nvim-neo-tree/neo-tree.nvim/blob/230ff118613fa07138ba579b89d13ec2201530b9/doc/neo-tree.txt#L1298-L1346

Related: https://github.com/Mofiqul/vscode.nvim/issues/147

Thanks in advance ;)

[ram-xv]

@Mofiqul +1