feat: recruitNewPlayer - @Valid and @RequestBody added

rest/src/main/java/cz/muni/fi/pa165/icehockeymanager/rest/controller/IceHockeyManagerApi.java

@@ -43,7 +43,7 @@ public class IceHockeyManagerApi {
     }
 
     @PostMapping("/player/recruitNew")
-    public final void recruitNewPlayer(PlayerCreateDTO player) {
+    public final void recruitNewPlayer(@Valid @RequestBody PlayerCreateDTO player) {
         teamManagerFacade.recruitNewPlayer(player);
     }