Add creational patterns, Interpreter; remove scripts; update README

01-creational/factory-method/PushService.java

@@ -0,0 +1,11 @@
+package factorymethod;
+
+public class PushService extends NotificationService {
+    private final String token;
+    public PushService(String token) { this.token = token; }
+
+    @Override
+    protected Notification createNotification() {
+        return new PushNotification(token);
+    }
+}