Added function to save and load a save game.

src/game/SaveGame.ts

@@ -0,0 +1,20 @@
+export const saveGameKey = "save_game";
+
+export interface SaveGame {
+    Level: number
+    Score: number
+}
+
+export function saveGame(saveGame: SaveGame) {
+    localStorage.setItem(saveGameKey, JSON.stringify(saveGame));
+}
+
+export function loadGame(): SaveGame | null {
+    const saveGame = localStorage.getItem(saveGameKey);
+
+    if(saveGame) {
+        return JSON.parse(saveGame);
+    }
+
+    return null;
+}