Add mini web demo

demo/tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": false,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react",
+    "incremental": true,
+    "target": "ESNext",
+    "useDefineForClassFields": true,
+    "allowSyntheticDefaultImports": true,
+    "outDir": "./dist/",
+    "sourceMap": true
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", "src"],
+  "exclude": ["node_modules"]
+}