Merge pull request #71 from htmlacademy/feature/eslint

#66 adds eslint

Author: nikolai-shabalin

.eslintrc

@@ -0,0 +1,9 @@
+{
+  "env": {
+    "es2022": true,
+    "node": true
+  },
+  "extends": [
+    "htmlacademy/vanilla"
+  ]
+}

index.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const fs = require('fs');
 const path = require('path');