Add ESLint utility

Author: felicio

.eslintrc.js

@@ -0,0 +1,11 @@
+module.exports = {
+  env: {
+    es6: true,
+    node: true,
+  },
+  extends: 'eslint:recommended',
+  rules: {
+    quotes: ['error', 'single'],
+    semi: ['error', 'always'],
+  },
+};