Add chapters 9-17 for the java book

Java-Kompendium/kap8/Task2.java

@@ -0,0 +1,11 @@
+import java.io.*;
+
+public class Task2 {
+    public static void main(String[] arguments) throws IOException {
+        for (int i = 20; i >= 0; i = i - 2) {
+            System.out.print(i);
+            System.out.print(' ');
+        }
+        System.out.println();
+    }
+}