Update README to reference shfmt

Author: chris-reeves

README.md

@@ -1,6 +1,6 @@
 # Bash Language Server
 
-Bash language server that brings an IDE-like experience for bash scripts to most editors. This is based on the [Tree Sitter parser][tree-sitter-bash] and supports [explainshell][explainshell] and [shellcheck][shellcheck].
+Bash language server that brings an IDE-like experience for bash scripts to most editors. This is based on the [Tree Sitter parser][tree-sitter-bash] and supports [explainshell][explainshell], [shellcheck][shellcheck] and [shfmt][shfmt].
 
 Documentation around configuration variables can be found in the [config.ts](https://github.com/bash-lsp/bash-language-server/blob/main/server/src/config.ts) file.
 
@@ -15,6 +15,7 @@ Documentation around configuration variables can be found in the [config.ts](htt
 - Documentation for symbols on hover
 - Workspace symbols
 - Rename symbol
+- Format document
 
 To be implemented:
 
@@ -24,7 +25,11 @@ To be implemented:
 
 ### Dependencies
 
-As a dependency, we recommend that you first install shellcheck [shellcheck][shellcheck] to enable linting: https://github.com/koalaman/shellcheck#installing . If shellcheck is installed, bash-language-server will automatically call it to provide linting and code analysis each time the file is updated (with debounce time or 500ms).
+As a dependency, we recommend that you first install shellcheck [shellcheck][shellcheck] to enable linting: https://github.com/koalaman/shellcheck#installing . If shellcheck is installed, bash-language-server will automatically call it to provide linting and code analysis each time the file is updated (with debounce time of 500ms).
+
+If you want your shell scripts to be formatted consistently, you can install [shfmt][shfmt]. If
+`shfmt` is installed then your documents will be formatted whenever you take the 'format document'
+action. In most editors this can be configured to happen automatically when files are saved.
 
 ### Bash language server
 
@@ -197,6 +202,7 @@ Please see [docs/development-guide][dev-guide] for more information.
 [sublime-text-lsp]: https://packagecontrol.io/packages/LSP-bash
 [explainshell]: https://explainshell.com/
 [shellcheck]: https://www.shellcheck.net/
+[shfmt]: https://github.com/mvdan/sh#shfmt
 [languageclient-neovim]: https://github.com/autozimu/LanguageClient-neovim
 [nvim-lspconfig]: https://github.com/neovim/nvim-lspconfig
 [vim-lsp]: https://github.com/prabirshrestha/vim-lsp