Added sell/buy event

src/main/java/com/alttd/events/SpawnShopEvent.java

@@ -0,0 +1,62 @@
+package com.alttd.events;
+
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+public final class SpawnShopEvent extends Event {
+    private final Player player;
+    private final int amount;
+    private final double price;
+    private final Material item;
+    private final int pointsBefore;
+    private final int pointsAfter;
+    private final boolean buy;
+
+    public SpawnShopEvent(Player player, int amount, double price, Material item,
+                          int pointsBefore, int pointsAfter, boolean buy) {
+        this.player = player;
+        this.amount = amount;
+        this.price = price;
+        this.item = item;
+        this.pointsBefore = pointsBefore;
+        this.pointsAfter = pointsAfter;
+        this.buy = buy;
+    }
+
+    public Player player() {
+        return player;
+    }
+
+    public int amount() {
+        return amount;
+    }
+
+    public double price() {
+        return price;
+    }
+
+    public Material item() {
+        return item;
+    }
+
+    public int pointsBefore() {
+        return pointsBefore;
+    }
+
+    public int pointsAfter() {
+        return pointsAfter;
+    }
+
+    public boolean buy() {
+        return buy;
+    }
+
+    @Override
+    public @NotNull HandlerList getHandlers() {
+        return null;
+    }
+}
+