Restructured the repo

Sorts/SortAlgorithm.java

@@ -0,0 +1,31 @@
+package Sorts;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ *  The common interface of most sorting algorithms
+ *
+ * @author Podshivalov Nikita (https://github.com/nikitap492)
+ *
+ **/
+public interface SortAlgorithm {
+
+    /**
+     * Main method arrays sorting algorithms
+     * @param unsorted - an array should be sorted
+     * @return a sorted array
+     */
+    <T extends Comparable<T>> T[] sort(T[] unsorted);
+
+    /**
+     * Auxiliary method for algorithms what wanted to work with lists from JCF
+     * @param unsorted - a list should be sorted
+     * @return a sorted list
+     */
+    @SuppressWarnings("unchecked")
+    default <T extends Comparable<T>> List<T> sort(List<T> unsorted){
+        return Arrays.asList(sort(unsorted.toArray((T[]) new Comparable[unsorted.size()])));
+    }
+
+}