Add star history graph

Author: bitdove

README.md

@@ -102,6 +102,9 @@ Below is the list of some of the most used Big O notations and their performance
 | **Counting sort**     | n + r           | n + r               | n + r               | n + r     | Yes       | r - biggest number in array |
 | **Radix sort**        | n * k           | n * k               | n * k               | n + k     | Yes       | k - length of longest key |
 
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=MasonCodingHere/cpp-algorithms&type=Date)](https://star-history.com/#MasonCodingHere/cpp-algorithms&Date)
 
 ## References
 1. [trekhleb's javascript-algorithms](https://github.com/trekhleb/javascript-algorithms)

README.zh-CN.md

@@ -97,6 +97,9 @@ cd cpp-algorithms/data-structures/linked-list
 | **计数排序**          | n + r     | n + r     | n + r         | n + r     | Yes       | r - 数组里最大的数    |
 | **基数排序**          | n * k     | n * k     | n * k         | n + k     | Yes       | k - 最长 key 的升序   |
 
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=MasonCodingHere/cpp-algorithms&type=Date)](https://star-history.com/#MasonCodingHere/cpp-algorithms&Date)
 
 ## 参考
 1. [trekhleb的javascript-algorithms仓库](https://github.com/trekhleb/javascript-algorithms)