Added playerOut() to BlackJack

This method sets the current playerIn state to false

src/main/java/org/bitbiome/classes/BlackJack.java

@@ -89,4 +89,8 @@ public class BlackJack {
             return false;
         }
     }
+
+    public void playerOut() {
+        this.playerIn = false;
+    }
 }