feat: add readme

Author: m-avagyan

README.md

@@ -0,0 +1,39 @@
+## use-in-viewport
+
+**React hook for check if the current element in viewport.**
+
+**Author**
+
+- name: _Martik Avagyan_
+- email: _<martikavagyan1@gmail.com>_
+- github: _[m-avagyan](https://github.com/m-avagyan)_
+
+## Getting started
+
+**Installation**
+
+`npm install use-in-viewport` or `yarn add use-in-viewport`
+
+**Example**
+
+```javascript
+import React, { useRef } from 'react';
+import useInViewport from 'use-in-viewport';
+
+function Example() {
+  const elementRef = useRef(null);
+  const inViewport = useInViewport(elementRef);
+
+  return (
+    <div ref={inViewport}>
+      Element is {inViewport ? 'in viewport' : 'not in viewport'}
+    </div>
+  );
+}
+
+export default Example;
+```
+
+---
+
+**Copyright (c) 2022 [Martik Avagyan](https://github.com/m-avagyan)**