create biddable interface

Took 5 seconds

src/main/java/ca/tweetzy/auctionhouse/ahv3/api/auction/Biddable.java

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+/*
+ * Auction House
+ * Copyright 2022 Kiran Hart
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ca.tweetzy.auctionhouse.ahv3.api.auction;
+
+public interface Biddable {
+}