Add some cardmarket properties

Most of these are nullable

README.md

@@ -49,6 +49,7 @@ To use the SDK with an API key, create an account at https://dev.pokemontcg.io t
   legalities: ILegality;
   images: ICardImage;
   tcgplayer?: ITCGPlayer;
+  cardmarket?: ICardmarket;
 ```
 
 ### IAbility

src/classes/card.ts

@@ -3,6 +3,7 @@ import { IAncientTrait } from "../interfaces/ancientTrait";
 import { IAttack } from "../interfaces/attack";
 import { ICard } from "../interfaces/card";
 import { ICardImage } from "../interfaces/image";
+import { ICardmarket } from "../interfaces/cardmarket";
 import { ILegality } from "../interfaces/legality";
 import { IQuery } from "../interfaces/query";
 import { IResistance } from "../interfaces/resistance";
@@ -37,6 +38,7 @@ export class Card implements ICard {
   legalities: ILegality;
   images: ICardImage;
   tcgplayer?: ITCGPlayer;
+  cardmarket?: ICardmarket;
 
   resource(): string {
     return "cards";

src/interfaces/card.ts

@@ -4,6 +4,7 @@ import { IAttack } from "../interfaces/attack";
 import { IResistance } from "../interfaces/resistance";
 import { IWeakness } from "../interfaces/weakness";
 import { ICardImage } from "./image";
+import { ICardmarket } from "./cardmarket";
 import { ILegality } from "./legality";
 import { ISet } from "./set";
 import { ITCGPlayer } from "./tcgplayer";
@@ -34,4 +35,5 @@ export interface ICard {
   legalities: ILegality;
   images: ICardImage;
   tcgplayer?: ITCGPlayer;
+  cardmarket?: ICardmarket;
 }

src/interfaces/cardmarket.ts

@@ -0,0 +1,21 @@
+export interface ICardmarket {
+  url: string;
+  updatedAt: string;
+  prices: {
+    averageSellPrice: number | null
+    lowPrice: number | null
+    trendPrice: number | null
+    germanProLow: number | null
+    suggestedPrice: number | null
+    reverseHoloSell: number | null
+    reverseHoloLow: number | null
+    reverseHoloTrend: number | null
+    lowPriceExPlus: number | null
+    avg1: number | null
+    avg7: number | null
+    avg30: number | null
+    reverseHoloAvg1: number | null
+    reverseHoloAvg7: number | null
+    reverseHoloAvg30: number | null
+  }
+}