Added README.md file for Rotate Array

189-rotate-array/README.md

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+<h2><a href="https://leetcode.com/problems/rotate-array">Rotate Array</a></h2> <img src='https://img.shields.io/badge/Difficulty-Medium-orange' alt='Difficulty: Medium' /><hr><p>Given an integer array <code>nums</code>, rotate the array to the right by <code>k</code> steps, where <code>k</code> is non-negative.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [1,2,3,4,5,6,7], k = 3
+<strong>Output:</strong> [5,6,7,1,2,3,4]
+<strong>Explanation:</strong>
+rotate 1 steps to the right: [7,1,2,3,4,5,6]
+rotate 2 steps to the right: [6,7,1,2,3,4,5]
+rotate 3 steps to the right: [5,6,7,1,2,3,4]
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [-1,-100,3,99], k = 2
+<strong>Output:</strong> [3,99,-1,-100]
+<strong>Explanation:</strong> 
+rotate 1 steps to the right: [99,-1,-100,3]
+rotate 2 steps to the right: [3,99,-1,-100]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>-2<sup>31</sup> &lt;= nums[i] &lt;= 2<sup>31</sup> - 1</code></li>
+	<li><code>0 &lt;= k &lt;= 10<sup>5</sup></code></li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Follow up:</strong></p>
+
+<ul>
+	<li>Try to come up with as many solutions as you can. There are at least <strong>three</strong> different ways to solve this problem.</li>
+	<li>Could you do it in-place with <code>O(1)</code> extra space?</li>
+</ul>