Added README.md file for Strange Printer II

Co-authored-by: Joshua Dierickse <joshua.dierickse@gmail.com>

Author: 2 people

1696-strange-printer-ii/README.md

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+<h2><a href="https://leetcode.com/problems/strange-printer-ii">Strange Printer II</a></h2> <img src='https://img.shields.io/badge/Difficulty-Hard-red' alt='Difficulty: Hard' /><hr><p>There is a strange printer with the following two special requirements:</p>
+
+<ul>
+	<li>On each turn, the printer will print a solid rectangular pattern of a single color on the grid. This will cover up the existing colors in the rectangle.</li>
+	<li>Once the printer has used a color for the above operation, <strong>the same color cannot be used again</strong>.</li>
+</ul>
+
+<p>You are given a <code>m x n</code> matrix <code>targetGrid</code>, where <code>targetGrid[row][col]</code> is the color in the position <code>(row, col)</code> of the grid.</p>
+
+<p>Return <code>true</code><em> if it is possible to print the matrix </em><code>targetGrid</code><em>,</em><em> otherwise, return </em><code>false</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/12/23/print1.jpg" style="width: 600px; height: 175px;" />
+<pre>
+<strong>Input:</strong> targetGrid = [[1,1,1,1],[1,2,2,1],[1,2,2,1],[1,1,1,1]]
+<strong>Output:</strong> true
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/12/23/print2.jpg" style="width: 600px; height: 367px;" />
+<pre>
+<strong>Input:</strong> targetGrid = [[1,1,1,1],[1,1,3,3],[1,1,3,4],[5,5,1,4]]
+<strong>Output:</strong> true
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> targetGrid = [[1,2,1],[2,1,2],[1,2,1]]
+<strong>Output:</strong> false
+<strong>Explanation:</strong> It is impossible to form targetGrid because it is not allowed to print the same color in different turns.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>m == targetGrid.length</code></li>
+	<li><code>n == targetGrid[i].length</code></li>
+	<li><code>1 &lt;= m, n &lt;= 60</code></li>
+	<li><code>1 &lt;= targetGrid[row][col] &lt;= 60</code></li>
+</ul>