Added README.md file for Find Bottom Left Tree Value

513-find-bottom-left-tree-value/README.md

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+<h2><a href="https://leetcode.com/problems/find-bottom-left-tree-value">Find Bottom Left Tree Value</a></h2> <img src='https://img.shields.io/badge/Difficulty-Medium-orange' alt='Difficulty: Medium' /><hr><p>Given the <code>root</code> of a binary tree, return the leftmost value in the last row of the tree.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2020/12/14/tree1.jpg" style="width: 302px; height: 182px;" />
+<pre>
+<strong>Input:</strong> root = [2,1,3]
+<strong>Output:</strong> 1
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2020/12/14/tree2.jpg" style="width: 432px; height: 421px;" />
+<pre>
+<strong>Input:</strong> root = [1,2,3,4,null,5,6,null,null,7]
+<strong>Output:</strong> 7
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</li>
+	<li><code>-2<sup>31</sup> &lt;= Node.val &lt;= 2<sup>31</sup> - 1</code></li>
+</ul>