Add UI

ui/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "xmrcheckout-ui",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "next": "15.5.9",
+    "qrcode": "1.5.4",
+    "react": "19.2.3",
+    "react-dom": "19.2.3"
+  },
+  "devDependencies": {
+    "@types/node": "20.14.12",
+    "@types/qrcode": "1.5.5",
+    "@types/react": "18.3.3",
+    "@types/react-dom": "18.3.0",
+    "autoprefixer": "^10.4.23",
+    "eslint": "9.9.0",
+    "eslint-config-next": "15.5.9",
+    "postcss": "^8.5.6",
+    "tailwindcss": "^3.4.14",
+    "typescript": "5.5.4"
+  }
+}