增加新组件的步骤

步骤：

• packages/vue/src/my-component/[package.json | index.ts | src/pc.vue] -- 组件模板
• packages/vue/package.json -- 组件主包依赖声明
• packages/renderless/src/my-component/[index.ts | vue.ts] -- 组件逻辑
• packages/theme/src/my-component/[index.less | vars.less] -- 组件样式
• packages/modules.json -- 组件入口配置 MyComponent path="vue/src/my-component/index.ts" / MyComponentPc path="vue/src/my-component/src/pc.vue"
• examples/sites/demos/apis/my-component.js -- 组件 API 文档
• examples/sites/demos/pc/app/my-component/webdoc/[my-component.cn.md | my-component.en.md | my-component.js] -- 组件 Demo/API 配置
• examples/sites/demos/pc/app/my-component/[basic-usage-composition-api.vue | basic-usage.spec.ts | basic-usage.vue] -- 组件 Demo 文档和E2E测试用例
• examples/sites/demos/pc/menus.js -- 左侧组件菜单配置

示例PR：https://github.com/opentiny/tiny-vue/pull/1683