feat: adds create-medusa-app (#377)

* feat: copied from medusa-cli

* chore: gitignore

* fix: add admin + storefront

* fix: dev experience enhancement

packages/create-medusa-app/tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2015",
+    "module": "commonjs",
+    "allowJs": true,
+    "declaration": false,
+    "outDir": "./dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.json", "src/**/*.js"],
+  "exclude": ["**/__tests__/**/*"]
+}