diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 70eaf70..db23f0e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -84,4 +84,26 @@ Tips:
 
 - Use lowercase.
 - Avoid long branch names.
-- Be specific but not overly detailed.
\ No newline at end of file
+- Be specific but not overly detailed.
+
+## Development Environment Setup
+
+After cloning the repository, you'll need to configure your local development environment:
+
+### 1. Install Dependencies
+
+```bash
+npm install
+```
+
+### 2. Configure Development Directory
+
+The repository includes a `dev/` directory with test files and examples. To prevent your local changes to these files from being committed to the repository, run:
+
+```bash
+npm run setup
+```
+
+This command configures Git to ignore future changes to files in the `dev/` directory while keeping the original files in the repository for all contributors to use.
+
+**Note:** You only need to run this once after cloning the repository.
diff --git a/package.json b/package.json
index 1a364c9..70540e5 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,8 @@
     "start": "webpack serve --config ./webpack.dev.js",
     "prepack": "npm run build",
     "lint": "eslint .",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "setup": "find dev/ -type f -exec git update-index --skip-worktree {} \\; && echo 'Dev environment configured: changes to dev/ files will be ignored by Git'"
   },
   "repository": {
     "type": "git",