[Improvement] Reorganize document (#1066)

packages/col/en-US.md

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+## Layout
+
+Quickly and easily create layouts with `van-row` and `van-col`
+
+### Install
+``` javascript
+import { Row, Col } from 'vant';
+
+Vue.use(Row).use(Col);
+```
+
+### Usage
+
+#### Basic Usage
+
+Layout are based on 24-column. The attribute `span` in `Col` means the number of column the grid spans. Of course, You can use `offset` attribute to set number of spacing on the left side of the grid.
+
+
+```html
+<van-row>
+  <van-col span="8">span: 8</van-col>
+  <van-col span="8">span: 8</van-col>
+  <van-col span="8">span: 8</van-col>
+</van-row>
+
+<van-row>
+  <van-col span="4">span: 4</van-col>
+  <van-col span="10" offset="4">offset: 4, span: 10</van-col>
+  <van-col span="6">span: 6</van-col>
+</van-row>
+
+<van-row>
+  <van-col offset="12" span="12">offset: 12, span: 12</van-col>
+</van-row>
+```
+
+
+#### Column Spacing
+
+Set grid spacing using `gutter` attribute. The default value is 0
+
+
+```html
+<van-row gutter="20">
+  <van-col span="8">span: 8</van-col>
+  <van-col span="8">span: 8</van-col>
+  <van-col span="8">span: 8</van-col>
+</van-row>
+```
+
+
+### API
+
+#### Row
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| gutter | grid spacing（px） | `String | Number` | - |
+
+#### Column
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| span | number of column the grid spans | `String | Number` | - |
+| offset | number of spacing on the left side of the grid | `String | Number` | - |