Update readme, make onExit and onResize optional

README.md

@@ -1,5 +1,74 @@
 # useWebGL
-React hook utility
+[React Hook](https://reactjs.org/docs/hooks-overview.html) to get access to a webgl context and manage canvas life cycle
+
+## Installation
+
+```sh
+# Yarn
+yarn add @nvd/use-webgl
+
+# NPM
+npm i --save @nvd/use-webgl
+```
+
+## Usage
+> This utility depends on React Hooks which are available as of react version 16.8.0 and higher.
+
+```tsx
+import React from "react"
+import { render } from "react-dom"
+import {createStore} from "redux"
+import { useWebGL } from "@nvd/use-webgl"
+
+const App = () => {
+    const [canvas, resizeCanvas] = useWebGL({ width: 250, height: 250 })
+
+    return (
+        <div> { canvas } </div>
+    );
+}
+
+render(
+    <App />,
+    document.getElementById('root'),
+)
+
+```
+
+## API
+
+### useWebGL
+> (options: UseWebGLOptions) =&#x3E; (JSX.Element | ((newWidth: number, newHeight: number) =&#x3E; void))[];
+
+Create a canvas and provide access to a webgl context object.
+
+```tsx
+
+const App = () => {
+    const [ canvas, resizeCanvas] = useWebGL({
+        width: 100,
+        height: 100,
+        onInit,
+        onResize,
+        onExit
+    })
+
+    ...
+}
+```
+
+### UseWebGLOptions
+Configuration object given to `useWebGL` function. Width and height are passed to the canvas to set up the initial size. onInit, onExit and onResize function are life cycle hooks that are used to do set up, cleanup or update your view for those events. Only width, height and onInit are required
+
+```ts
+declare type UseWebGLOptions = {
+    width: number;
+    height: number;
+    onInit: (GL: WebGLRenderingContext | null, canvas: HTMLCanvasElement) => void;
+    onExit?: () => void;
+    onResize?: (width: number, height: number) => void;
+};
+```
 
 ## License
 MIT

src/index.tsx

@@ -5,8 +5,8 @@ type UseWebGLOptions = {
     height: number,
 
     onInit: (GL: WebGLRenderingContext | null, canvas: HTMLCanvasElement) => void
-    onExit: () => void
-    onResize: (width: number, height: number) => void
+    onExit?: () => void
+    onResize?: (width: number, height: number) => void
 }
 
 const useWebGL = (options: UseWebGLOptions) => {