Added ESLint

package.json

@@ -4,7 +4,8 @@
   "description": "Vara Network token list",
   "main": "scripts/verifier.js",
   "scripts": {
-    "check": "node scripts/verifier.js"
+    "check": "npm run lint && node scripts/verifier.js",
+    "lint": "eslint ."
   },
   "keywords": [
     "vara network",
@@ -17,5 +18,10 @@
     "ajv": "^8.17.1",
     "ajv-formats": "^3.0.1",
     "image-size": "^1.1.1"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.8.0",
+    "eslint": "^9.8.0",
+    "globals": "^15.8.0"
   }
 }