Add readme.

Author: tangbc

README.md

@@ -0,0 +1,81 @@
+<a href="https://npmjs.com/package/vue-virtual-scroll-list">
+	<img src="https://img.shields.io/npm/v/vue-virtual-scroll-list.svg?style=flat" alt="NPM version"/>
+</a>
+
+## vue-virtual-scroll-list
+
+> A vue component that support big data by using virtual scroll list. Tiny, smooth and without any dependence.
+
+
+## How it works
+
+<img src="https://tangbc.github.io/github-images/virtual-scroll-list-4.gif">
+
+
+## Demos
+
+* [vue-virtual-scroll-list with 10,0000 finite data](https://tangbc.github.io/vue-virtual-scroll-list/demo/finite/).
+
+* [vue-virtual-scroll-list infinite data by increasing 20 each time](https://tangbc.github.io/vue-virtual-scroll-list/demo/infinite/).
+
+
+## Usage
+
+Using by npm:
+
+```
+npm install vue-virtual-scroll-list --save
+```
+
+
+## Example
+
+Using Vue single file components:
+
+```javascript
+<template>
+	<div>
+		<VirtualList
+			:size="40"
+			:remain="8"
+		>
+			<Item v-for="(item, index) of items" :item="item" :key="item.id" />
+		</VirtualList>
+	</div>
+</template>
+
+<script>
+	import Item from '../item.vue';
+	import VirtualList from 'vue-virtual-scroll-list';
+
+	export default {
+		name: 'demo',
+
+		components: { Item, VirtualList },
+
+		data () {
+			return {
+				items: [...]
+			}
+		}
+	}
+</script>
+```
+
+The `<Item />` component is defined outside but included inside the `<VirtualList />` component. `VirtualList` has nothing to do with `<Item />`, so you can use virtual list with any list item component your project need, you just want to care about component `<Item />` and data `items`.
+
+
+## Support props type
+
+*Prop* | *Type* | *Required* | *Description* |
+:--- | :--- | :--- | :--- |
+| size | Number | ✓ | Each list item height (pixel). |
+| remain | Number | ✓ | How many items except show in virtual list viewport, so `size` and `remian` will determine the virtual list outside container height (size × remian). |
+| onScroll | Function | * | Call on virtual list scroll event hanlding, param: `(scrollTop, e)`  |
+| toTop | Event | * | An event emit by virtual list component when the list is scrolled on top. |
+| toBottom | Event | * | An event emit by virtual list component when the list is scrolled on bottom. |
+
+
+## License
+
+[MIT License](https://github.com/tangbc/vue-virtual-scroll-list/blob/master/LICENSE)