chore(cli): extract create-vant-cli-app package

packages/create-vant-cli-app/src/index.ts

@@ -0,0 +1,27 @@
+import inquirer from 'inquirer';
+import { mkdirSync, existsSync } from 'fs-extra';
+import { VanGenerator } from './generator';
+
+const PROMPTS = [
+  {
+    type: 'input',
+    name: 'name',
+    message: 'Your package name'
+  }
+];
+
+export default async function run() {
+  const { name } = await inquirer.prompt(PROMPTS);
+
+  if (!existsSync(name)) {
+    mkdirSync(name);
+  }
+
+  const generator = new VanGenerator(name);
+
+  return new Promise(resolve => {
+    generator.run(resolve);
+  });
+}
+
+run();