How do I add a vim-scripts plugin to vim?

If you think the plugin would be useful to other people, you can do a PR in nixpkgs, an example:
https://github.com/NixOS/nixpkgs/pull/127898/files

If the plugin is only for you, add it to your configuration. E.g. from my dotfiles:

Notice that src can be also a local directory, that’s up to you

After that, is just another plugin, install it with home-manager like any other plugin:

programs.neovim.plugins = [ visual-star];
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