Add more documentation for using NBTUtil

[Pysis868]

I tried some combinations and still have no results.
Trying to operate on a "playerdata/*.dat" file.
I'm using Cygwin on Windows, so I may need to fix my paths. I have been using Windows-style for now, with spaces.

Referenced these links for help:

• https://minecraft.fandom.com/wiki/NBT_path_format
• #35

Failed Examples:

> NBTUtil.exe "$file" --path='Inventory[]' --print
Operation complete.  Nodes succeeded: 0  Nodes failed: 0

> NBTUtil.exe "$file" --path='{}' --printtree
Operation complete.  Nodes succeeded: 0  Nodes failed: 0

[Radon8472]

@Pysis868

It took me some time to find out how this tool is working, you should try to specify the path to your file after the "--path" argument.

e.g.
NBTUtil --path "level.dat" --printtree

You can access sub-keys in the nbt data by appending them \-seperated after the filename
e.g.
NbtUtil --path "level.dat\Data\Version