Update README.md

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-<h2><a href="https://leetcode.com/problems/function-composition/">2629. Function Composition</a></h2><h3>Easy</h3><hr><div><p>Given an array of functions&nbsp;<code>[f<span style="font-size: 10.8333px;">1</span>, f<sub>2</sub>, f<sub>3</sub>,&nbsp;..., f<sub>n</sub>]</code>, return&nbsp;a new function&nbsp;<code>fn</code>&nbsp;that is the <strong>function&nbsp;composition</strong> of the array of functions.</p>
+<h2><a href="https://leetcode.com/problems/function-composition/">2629. Function Composition</a></h2><img src="https://img.shields.io/badge/Easy-brightgreen" alt="Easy" /><hr><div><p>Given an array of functions&nbsp;<code>[f<span style="font-size: 10.8333px;">1</span>, f<sub>2</sub>, f<sub>3</sub>,&nbsp;..., f<sub>n</sub>]</code>, return&nbsp;a new function&nbsp;<code>fn</code>&nbsp;that is the <strong>function&nbsp;composition</strong> of the array of functions.</p>
 
 <p>The&nbsp;<strong>function&nbsp;composition</strong>&nbsp;of&nbsp;<code>[f(x), g(x), h(x)]</code>&nbsp;is&nbsp;<code>fn(x) = f(g(h(x)))</code>.</p>