Added README.md file for Add Two Integers

2383-add-two-integers/README.md

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+<h2><a href="https://leetcode.com/problems/add-two-integers">Add Two Integers</a></h2> <img src='https://img.shields.io/badge/Difficulty-Easy-brightgreen' alt='Difficulty: Easy' /><hr>Given two integers <code>num1</code> and <code>num2</code>, return <em>the <strong>sum</strong> of the two integers</em>.
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> num1 = 12, num2 = 5
+<strong>Output:</strong> 17
+<strong>Explanation:</strong> num1 is 12, num2 is 5, and their sum is 12 + 5 = 17, so 17 is returned.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> num1 = -10, num2 = 4
+<strong>Output:</strong> -6
+<strong>Explanation:</strong> num1 + num2 = -6, so -6 is returned.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>-100 &lt;= num1, num2 &lt;= 100</code></li>
+</ul>