added basic eslint config

packages/app/eslint.config.js

@@ -0,0 +1,17 @@
+import js from "@eslint/js"
+import globals from "globals"
+import pluginReact from "eslint-plugin-react"
+import { defineConfig } from "eslint/config"
+
+export default defineConfig([
+	{
+		files: ["**/*.{js,mjs,cjs,jsx}"],
+		plugins: { js },
+		extends: ["js/recommended"],
+	},
+	{
+		files: ["**/*.{js,mjs,cjs,jsx}"],
+		languageOptions: { globals: globals.browser },
+	},
+	pluginReact.configs.flat.recommended,
+])