docs: translate docs of composables (#10561)

packages/vant/docs/markdown/use-rect.en-US.md

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+# useRect
+
+### Intro
+
+Get the size of an element and its position relative to the viewport, equivalent to [Element.getBoundingClientRect](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect).
+
+## Usage
+
+### Basic Usage
+
+```html
+<div ref="root" />
+```
+
+```js
+import { ref, onMounted } from 'vue';
+import { useRect } from '@vant/use';
+
+export default {
+  setup() {
+    const root = ref();
+
+    onMounted(() => {
+      const rect = useRect(root);
+      console.log(rect); // -> the size of an element and its position relative to the viewport
+    });
+
+    return { root };
+  },
+};
+```
+
+## API
+
+### Type Declarations
+
+```ts
+function useRect(
+  element: Element | Window | Ref<Element | Window | undefined>
+): DOMRect;
+```
+
+### Return Value
+
+| Name | Description | Type |
+| --- | --- | --- |
+| width | Width of the element | _number_ |
+| height | Height of the element | _number_ |
+| top | The distance from the top to the top-left of the viewport | _number_ |
+| left | The distance from the left to the top-left of the viewport | _number_ |
+| right | The distance from the right to the top-left of the viewport | _number_ |
+| bottom | The distance from the bottom to the top-left of the viewport | _number_ |