add leetcode problem-cn part2

算法题（国内版）/problem (English)/不用加号的加法(English) [add-without-plus-lcci].html

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+<p>Write a function that adds two numbers. You should not use + or any arithmetic operators.</p>
+
+<p><strong>Example:</strong></p>
+
+<pre>
+<strong>Input:</strong> a = 1, b = 1
+<strong>Output:</strong> 2</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>Note: </strong></p>
+
+<ul>
+	<li><code>a</code>&nbsp;and&nbsp;<code>b</code>&nbsp;may be 0 or negative.</li>
+	<li>The result fits in 32-bit integer.</li>
+</ul>