chore: configure eslint and update gitignore

package.json

@@ -4,7 +4,8 @@
   "description": "本地2FA账号密码管理工具",
   "main": "main.js",
   "scripts": {
-    "start": "electron ."
+    "start": "electron .",
+    "lint": "eslint ."
   },
   "keywords": [
     "2fa",
@@ -14,10 +15,12 @@
   "author": "",
   "license": "MIT",
   "devDependencies": {
-    "electron": "^28.0.0"
+    "electron": "^28.0.0",
+    "eslint": "^9.39.2"
   },
   "dependencies": {
     "crypto-js": "^4.2.0",
+    "jsqr": "^1.4.0",
     "sql.js": "^1.10.0"
   }
 }