[Doc] rename component README file (#3662)

src/progress/README.md

@@ -0,0 +1,66 @@
+# Progress
+
+### Install
+
+``` javascript
+import { Progress } from 'vant';
+
+Vue.use(Progress);
+```
+
+## Usage
+
+### Basic Usage
+
+Use 'percentage' prop to set current progress
+
+```html
+<van-progress :percentage="50" />
+```
+
+
+### Inactive
+
+```html
+<van-progress inactive :percentage="50" />
+```
+
+
+### Custom Style
+
+Use `pivot-text` to custom text，use `color` to custom bar color
+
+```html
+<van-progress
+  pivot-text="Orange"
+  color="#f2826a"
+  :percentage="25"
+/>
+
+<van-progress
+  pivot-text="Red"
+  color="#f44"
+  :percentage="50"
+/>
+
+<van-progress
+  :percentage="75"
+  pivot-text="Purple"
+  pivot-color="#7232dd"
+  color="linear-gradient(to right, #be99ff, #7232dd)"
+/>
+```
+
+## API
+
+### Props
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| inactive | Whether to be gray | `Boolean` | `false` |
+| percentage | Percentage | `Number` | `0` |
+| show-pivot | Whether to show text | `Boolean` | `true` |
+| color | Color | `String` | `#1989fa` |
+| pivot-text | Text | `String` | percentage |
+| pivot-color | Text background color | `String` | inherit progress color |
+| text-color | Text color | `String` | `#fff` |