added more context with example

Author: sugan0tech

vertical-slice-architecture/README.md

@@ -42,3 +42,4 @@ Use Vertical Slice Architecture when
 * [How to Implement Vertical Slice Architecture by Gary Woodfine](https://garywoodfine.com/implementing-vertical-slice-architecture/)
 * [youtube](https://www.youtube.com/watch?v=B1d95I7-zsw)
 * [medium](https://medium.com/sahibinden-technology/package-by-layer-vs-package-by-feature-7e89cde2ae3a)
+* [A reference application](https://github.com/sugan0tech/Event-Manager)

vertical-slice-architecture/src/main/java/com/iluwatar/verticalslicearchitecture/App.java

@@ -28,7 +28,11 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 /**
- * main application.
+ * Main application.
+ * The main objective of this code sample is for you to have a look at how the view, entity, repository and Service are
+ * organized.
+ * No matter what application you are building Layer by Feature will always give the upper hand of better
+ * maintainability.
  */
 
 @SpringBootApplication