Added DeckOfCards class

src/main/java/edu/ntnu/stud/cardgame/DeckOfCards.java

+package edu.ntnu.stud.cardgame;
+
+import java.util.ArrayList;
+import java.util.Random;
+import java.util.List;
+
+public class DeckOfCards {
+  private final char[] suit = { 'S', 'H', 'D', 'C' };
+  private final List<PlayingCard> deck;
+  Random random = new Random();
+
+  public DeckOfCards(){
+    deck = new ArrayList<>();
+
+    for (int i = 0; i < 52; i++) {
+      int face = random.nextInt(13)+1;
+      int suitNum = random.nextInt(4);
+      deck.add(new PlayingCard(suit[suitNum], face));
+    }
+  }
+
+  public List<PlayingCard> getDeck() {
+    return deck;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    for (PlayingCard card : deck) {
+      sb.append(card.getAsString());
+      sb.append("\n");
+    }
+    return sb.toString();
+  }
+}