add eslint and format scripts

package.json

@@ -20,7 +20,10 @@
     "build:types": "tsc -p tsconfig.types.json",
     "example:client": "node examples/psn_client.js",
     "example:server": "node examples/psn_server.js",
-    "prepublishOnly": "npm run build"
+    "prepublishOnly": "npm run build",
+    "lint:check": "eslint ./",
+    "format:check": "prettier ./ --check",
+    "format:write": "prettier ./ --write"
   },
   "files": [
     "dist"
@@ -36,6 +39,9 @@
     "@types/node": "22.8.7",
     "prettier": "3.3.3",
     "rimraf": "6.0.1",
-    "typescript": "5.6.3"
+    "typescript": "5.6.3",
+    "eslint": "8.48.0",
+    "eslint-config-airbnb": "19.0.4",
+    "eslint-config-prettier": "9.0.0"
   }
 }