added chain of responsibility example

src/learn/simple_responsibility_chain/Main.java

@@ -0,0 +1,21 @@
+package learn.simple_responsibility_chain;
+
+public class Main {
+    public static void main(String[] args) {
+        Handler firstHandler = new ConcreteHandler1();
+        Handler secondHandler = new ConcreteHandler2();
+        Handler thirdHandler = new ConcreteHandler3();
+
+        firstHandler.setSuccessor(secondHandler);
+        secondHandler.setSuccessor(thirdHandler);
+
+        Request request1 = new Request("dog");
+        firstHandler.handleRequest(request1);
+
+        Request request2 = new Request("3");
+        firstHandler.handleRequest(request2);
+
+        Request request3 = new Request("house");
+        firstHandler.handleRequest(request3);
+    }
+}