added selection sort to readme listing

Author: marioplumbarius

README.md

@@ -33,6 +33,7 @@ gradle clean assemble
 
 ## Available algorithms
 - [Insertion Sort](https://github.com/marioluan/java-sorting-algorithms/blob/master/src/main/java/io/github/marioluan/algorithms/sorting/InsertionSort.java)
+- [Selection Sort](https://github.com/marioluan/java-sorting-algorithms/blob/master/src/main/java/io/github/marioluan/algorithms/sorting/SelectionSort.java)
 
 ## References
 - [https://www.coursera.org/learn/algorithms-part1](https://www.coursera.org/learn/algorithms-part1)