Added schema description to Greeting

template-server/src/main/java/de/twomartens/templateservice/entity/Greeting.java

@@ -1,5 +1,6 @@
 package de.twomartens.templateservice.entity;
 
+import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.*;
 
 @Builder
@@ -11,6 +12,7 @@ import lombok.*;
 public class Greeting {
 
   @NonNull
+  @Schema(description = "This message is displayed")
   private final String message;
 
 }