Create readme : 0242-valid-anagram

Author: shimhun99

LeetCode/Easy/0242-valid-anagram/README.md

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+<h2><a href="https://leetcode.com/problems/valid-anagram">242. Valid Anagram</a></h2><h3>Easy</h3><hr><p>Given two strings <code>s</code> and <code>t</code>, return <code>true</code> if <code>t</code> is an <span data-keyword="anagram">anagram</span> of <code>s</code>, and <code>false</code> otherwise.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;anagram&quot;, t = &quot;nagaram&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">true</span></p>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;rat&quot;, t = &quot;car&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">false</span></p>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= s.length, t.length &lt;= 5 * 10<sup>4</sup></code></li>
+	<li><code>s</code> and <code>t</code> consist of lowercase English letters.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Follow up:</strong> What if the inputs contain Unicode characters? How would you adapt your solution to such a case?</p>