add readme

Author: smmoosavi

README.md

@@ -1,2 +1,70 @@
 # react-use-data-loader
+
 React hook for loading data
+
+# Installation
+
+Using npm:
+
+```
+$ npm install --save react-use-data-loader
+```
+
+Using yarn:
+
+```
+$ yarn add react-use-data-loader
+```
+
+Since this module uses React's upcoming Hooks feature, to try this out you'll need to install the 16.7.0-alpha.0 version of react and react-dom:
+
+```
+$ yarn add react@16.7.0-alpha.0 react-dom@16.7.0-alpha.0
+```
+
+# Usage
+
+```jsx
+import React from 'react'
+import { useDataLoader } from 'react-use-data-loader'
+
+async function getData(id) {
+  /* async api call */
+
+  return 'item ' + id
+}
+
+function Example({ id }) {
+  const { data, error, loading, retry } = useDataLoader(getData, id)
+
+  if (loading) {
+    return <div>loading...</div>
+  }
+
+  if (error) {
+    return <div>Error</div>
+  }
+
+  return <ViewData data={data} />
+}
+
+function App() {
+  return <Example id={3} />
+}
+```
+
+# API
+
+```ts
+
+useDataLoader(getData: GetData, ...args: Args) => ({
+  data: Data | null,
+  error: Error | null,
+  loading: boolean,
+  retry: Retry,
+})
+
+type GetData = (...args: Args) => Promise<Data>
+type Retry = () => void
+
+```