Add singleLinkedList code

Author: jbee37142

…thm/linkedlist/SingleLinkedListTest.java …ure/linkedlist/SingleLinkedListTest.javasrc/test/java/algorithm/linkedlist/SingleLinkedListTest.java renamed to src/test/java/datastructure/linkedlist/SingleLinkedListTest.java src/test/java/algorithm/linkedlist/SingleLinkedListTest.java renamed to src/test/java/datastructure/linkedlist/SingleLinkedListTest.java

@@ -1,4 +1,4 @@
-package algorithm.linkedlist;
+package datastructure.linkedlist;
 
 import org.junit.Test;