Add themes

src/app/types/SettingsType.ts

@@ -1,6 +1,7 @@
 export class SettingsType {
   constructor(
     public allowNotifications: boolean = true,
-    public alwaysShowGamesInSidebar: boolean = true
+    public alwaysShowGamesInSidebar: boolean = true,
+    public theme: number = 0
   ) { }
 }