add vim-whitespace

diff --git a/vim-whitespace/README.md b/vim-whitespace/README.md
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+---
+title: vim-whitespace
+homepage: https://webinstall.dev/vim-whitespace
+tagline: |
+  vim whitespace sets tab, whitespace, trailing whitespace rules to reasonable values
+---
+
+To update (replacing the current version) run `webi vim-whitespace`.
+
+## Cheat Sheet
+
+The idea that tabs should be 8 spaces wide is redonkulous.
+
+This vim-whitespace plugin sets tabs to spaces (4 wide), trim trailing
+whitespace, and makes whitespace handling consistent.
+
+### How to configure manually
+
+Create the file `~/.vim/plugins/whitespace.vim`. Add the same contents as
+<https://github.com/webinstall/webi-installers/blob/master/vim-whitespace/whitespace.vim>.
+
+That will look something like this:
+
+```vim
+" handle tabs as 4 spaces, in every direction, consintently
+set tabstop=4
+set shiftwidth=4
+set smarttab
+set expandtab
+set softtabstop=4
+
+" remove trailing whitespace on save
+autocmd BufWritePre * :%s/\s\+$//e
+```
+
+You'll then need to update `~/.vimrc` to source that plugin:
+
+```vim
+" Tabs & Whitespace: reasonable defaults from webinstall.dev/vim-whitespace
+source ~/.vim/plugins/whitespace.vim
+```

diff --git a/vim-whitespace/install.sh b/vim-whitespace/install.sh
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+++ b/vim-whitespace/install.sh
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+#!/bin/bash
+
+function __init_vim_whitespace() {
+    set -e
+    set -u
+
+    mkdir -p "$HOME/.vim/plugins"
+    rm -rf "$HOME/.vim/plugins/whitespace.vim"
+
+    echo ""
+
+    if [ ! -e "$HOME/.vimrc" ]; then
+        touch "$HOME/.vimrc"
+    fi
+
+    if ! [ -f "$HOME/.vim/plugins/whitespace.vim" ]; then
+        mkdir -p ~/.vim/plugins
+        WEBI_HOST=${WEBI_HOST:-"https://webinstall.dev"}
+        curl -fsS -o ~/.vim/plugins/whitespace.vim "$WEBI_HOST/packages/vim-whitespace/whitespace.vim"
+    fi
+
+    if ! grep 'source.*plugins.whitespace.vim' -r ~/.vimrc > /dev/null 2> /dev/null; then
+        set +e
+        mkdir -p ~/.vim/plugins
+        printf '\n" Tab & Whitespace: reasonable defaults from webinstall.dev/vim-whitespace\n' >> ~/.vimrc
+        printf 'source ~/.vim/plugins/whitespace.vim\n' >> ~/.vimrc
+        set -e
+        echo "added ~/.vim/plugins/whitespace.vim"
+        echo "updated ~/.vimrc with 'source ~/.vim/plugins/whitespace.vim'"
+        echo ""
+    fi
+
+    echo "Vim's has been updated with reasonable whitespace settings."
+}
+
+__init_vim_whitespace

diff --git a/vim-whitespace/whitespace.vim b/vim-whitespace/whitespace.vim
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+++ b/vim-whitespace/whitespace.vim
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+" The default tab width is 8 spaces, which is redonkulous.
+" We'll set it to 4 instead, which is reasonable.
+" (feel free to change to 2, but 3 is right out).
+"
+" Also, I'm not actually sure what the individual options do,
+" but it's something like 'always use spaces' and
+" 'use the same width when typing, tabbing, deleting, moving, etc'
+set tabstop=4
+set shiftwidth=4
+set smarttab
+set expandtab
+set softtabstop=4
+
+" remove trailing whitespace on save
+autocmd BufWritePre * :%s/\s\+$//e