add vim-shell

vim-shell/README.md

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+---
+title: vim-shell
+homepage: https://webinstall.dev/vim-spell
+tagline: |
+  vim shell sets the default shell for vim
+---
+
+To update (replacing the current version) run `webi vim-shell`.
+
+## Cheat Sheet
+
+> `set shell=bash`, always
+
+Especially if you use a non-bash-compatible shell, such as [fish](/fish), you
+should set `set shell=bash` as the **first line** in your `~/.vimrc`.
+
+This script does that for you.
+
+### Why set bash as your vim shell?
+
+Any vim plugin that uses shell scripting will assume _bash_ - just because
+that's the way the world is.
+
+Even if you have a mostly-bash-compatible shell, such as _zsh_, it's a good idea
+to set the vim shell to bash, just to avoid any compatibility issues.