Add a devenv setup with git hooks

Author: raszi

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.envrc

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+eval "$(devenv direnvrc)"
+use devenv

.gitignore

@@ -12,3 +12,4 @@
 # devenv
 .devenv
 .devenv.flake.nix
+.pre-commit-config.yaml

README.md

@@ -46,3 +46,15 @@ open "Format JSON.shortcut"
 ```
 
 To see all the options, run `format-code shortcuts --help`.
+
+## Development
+
+The project uses [devenv](https://devenv.sh) to install Node.js and npm. To
+enter the dev shell, run:
+
+```sh
+devenv shell
+```
+
+If you use [direnv](https://direnv.net), run `direnv allow` one time. Then
+direnv loads the dev shell when you enter the folder.