implemented usePreviousPlayer, preparing to implement gold chip funcitonality

src/hooks/useCurrentPlayer.tsx

@@ -0,0 +1,19 @@
+import { AppState, PlayerData } from "../util/types";
+
+export const useCurrentPlayer = (state: AppState): PlayerData | null => {
+    /**
+     * takes in current app state and the current active player
+     * @param state = current app state
+     * @returns: @PlayerData if a matching player is found,
+     * or @null if one is not found
+     */
+
+    const currentPlayers = state.players;
+    if (!currentPlayers) return null;
+
+    for (let each of currentPlayers) {
+        if (each.turnActive) return each;
+    }
+
+    return null;
+}