Add generic Node classes (#2782)

Co-authored-by: Andrii Siriak <siryaka@gmail.com>

DevUtils/Searches/SearchAlgorithm.java

@@ -0,0 +1,17 @@
+package DevUtils.Searches;
+
+/**
+ * The common interface of most searching algorithms
+ *
+ * @author Podshivalov Nikita (https://github.com/nikitap492)
+ */
+public interface SearchAlgorithm {
+
+  /**
+   * @param key is an element which should be found
+   * @param array is an array where the element should be found
+   * @param <T> Comparable type
+   * @return first found index of the element
+   */
+  <T extends Comparable<T>> int find(T array[], T key);
+}