Update README.md

Author: harmeetsingh11

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-<h2><a href="https://leetcode.com/problems/counter">2732. Counter</a></h2><h3>Easy</h3><hr><p>Given an integer&nbsp;<code>n</code>,&nbsp;return a <code>counter</code> function. This <code>counter</code> function initially returns&nbsp;<code>n</code>&nbsp;and then returns 1 more than the previous value every subsequent time it is called (<code>n</code>, <code>n + 1</code>, <code>n + 2</code>, etc).</p>
+<h2><a href="https://leetcode.com/problems/counter">2732. Counter</a></h2><img src="https://img.shields.io/badge/Easy-brightgreen" alt="Easy" /><hr><p>Given an integer&nbsp;<code>n</code>,&nbsp;return a <code>counter</code> function. This <code>counter</code> function initially returns&nbsp;<code>n</code>&nbsp;and then returns 1 more than the previous value every subsequent time it is called (<code>n</code>, <code>n + 1</code>, <code>n + 2</code>, etc).</p>
 
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 <p><strong class="example">Example 1:</strong></p>