docs: add boilerplate type desc (#2250)

docs/source/en/intro/quickstart.md

@@ -475,6 +475,8 @@ That is all of it, for more detail, see [Unit Testing](../core/unittest.md).
 
 We can only touch the tip of the iceberg of Egg with the above short sections.
 Where to go from here? read our documentation to better understand the framework.
+
+- About Egg boilerplate type, See [Boilerplate Type Description](../tutorials/index.md).
 - Egg provides a powerful mechanism for extending features. See [Plugin](../basics/plugin.md).
 - Egg framework allows small or large teams to work together as fast as possible under the well-documented conventions and coding best practices. In addition, the teams can build up logics on top of the framework to better suit their special needs. See more on [Frameworks].(../advanced/framework.md).
 - Egg framework provides code reusabilities and modularities. See details at [Progressive](../tutorials/progressive.md).

docs/source/en/tutorials/index.md

@@ -4,6 +4,22 @@ title: Tutorials
 - [Progressive Development](./progressive.md)
 - [RESTful API](./restful.md)
 
+## Boilerplate Type Description
+
+You can use boilerplate type like this:
+
+```bash
+$ egg-init --type=simple
+```
+### Options
+
+boilerplate type | Description
+:----: | ----:
+simple | Simple egg app boilerplate 
+empty  | Empty egg app boilerplate 
+plugin | egg plugin boilerplate
+framework | egg framework boilerplate
+
 ## Template Engines
 
 Build in [egg-view] as template engine solution and support multiple render, which is called by plugin but keeping the consistent render API. Refer to [how to use templates](../core/view.md)，More details on [template plugin development](../advanced/view-plugin.md).

docs/source/zh-cn/intro/quickstart.md

@@ -446,6 +446,7 @@ $ npm test
 
 短短几章内容，只能讲 Egg 的冰山一角，我们建议开发者继续阅读其他章节：
 
+- 关于骨架类型，参见[骨架说明](../tutorials/index.md)
 - 提供了强大的扩展机制，参见[插件](../basics/plugin.md)。
 - 一个大规模的团队需要遵循一定的约束和约定，在 Egg 里我们建议封装适合自己团队的上层框架，参见 [框架开发](../advanced/framework.md)。
 - 这是一个渐进式的框架，代码的共建，复用和下沉，竟然可以这么的无痛，建议阅读 [渐进式开发](../tutorials/progressive.md)。

docs/source/zh-cn/tutorials/index.md

@@ -4,6 +4,23 @@ title: 教程
 - [渐进式开发](./progressive.md)
 - [RESTful API](./restful.md)
 
+## 骨架类型说明
+
+你可以使用骨架类型，像下面这样:
+
+```bash
+$ egg-init --type=simple
+```
+
+### 选项
+
+骨架类型 | 说明
+:----: | ----:
+simple | 简单 egg 应用程序骨架
+empty  | 空的 egg 应用程序骨架
+plugin | egg plugin 骨架
+framework | egg framework 骨架
+
 ## 模板引擎
 
 框架内置 [egg-view] 作为模板解决方案，并支持多模板渲染，每个模板引擎都以插件的方式引入，但保持渲染的 API 一致。查看[如何使用模板](../core/view.md)，如果想更深入的了解，可以查看[模板插件开发](../advanced/view-plugin.md)。