preservim/nerdtree ? reverse-engineered prompt

Build me a Vim plugin that gives me a file tree sidebar so I can browse folders, open files, and do basic file actions without leaving the editor.

I want it to feel like a normal Vim plugin, with commands to open, close, toggle, and focus the tree, plus an easy way to map keys in my vimrc. It should show a helpful quick help view inside the tree, and it should work well when Vim starts with no files or with a directory argument. Please include good documentation for installing it with common plugin managers and with Vim’s built in package support, plus a simple getting started guide and examples for common setup.

If there are useful extension points for things like icons, git status, or syntax highlighting, make sure the plugin is structured so those can hook in cleanly. Look up current Vim docs online if you need to, and keep the code compatible with both Vim and Neovim where practical.