ADD: first draft of loader screen fxml

src/main/resources/no/ntnu/cardgame/loader.fxml

+<?xml version="1.0" encoding="UTF-8"?>
+
+
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.ProgressBar?>
+<?import javafx.scene.image.Image?>
+<?import javafx.scene.image.ImageView?>
+<?import javafx.scene.layout.AnchorPane?>
+<AnchorPane prefHeight="549.0" prefWidth="821.0" style="-fx-background-color: #fcfcfc;" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Loader">
+   <children>
+      <ImageView fitHeight="193.0" fitWidth="429.0" layoutX="172.0" layoutY="121.0" pickOnBounds="true" preserveRatio="true">
+         <image>
+            <Image url="@img/fixedImg/cardjavaLogo.PNG" />
+         </image>
+      </ImageView>
+      <ProgressBar layoutX="301.0" layoutY="308.0" prefWidth="200.0" />
+      <Button layoutX="336.0" layoutY="336.0" mnemonicParsing="false" text="PLAY [Check cards]" />
+   </children>
+</AnchorPane>