implement a multi-file template interpreter

examples/react-app-generator/templates/package-json.tmpl

@@ -0,0 +1,45 @@
+{
+  "name": "masonry-generated-blog-app",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-router-dom": "^6.8.0",
+    "react-scripts": "5.0.1",
+    "@types/react": "^18.0.27",
+    "@types/react-dom": "^18.0.10",
+    "typescript": "^4.9.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "devDependencies": {
+    "@types/node": "^18.13.0",
+    "tailwindcss": "^3.2.4",
+    "autoprefixer": "^10.4.13",
+    "postcss": "^8.4.21"
+  }
+}
+