Add handling for ForgeExcelConfigData.

src/main/java/emu/grasscutter/data/common/MaterialItemsData.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.data.common;
+
+import java.util.List;
+
+public class MaterialItemsData {
+	private int id;
+	private int count;
+
+	public int getId() {
+		return this.id;
+	}
+	public void setId(int value) {
+		this.id = value;
+	}
+
+	public int getCount() {
+		return this.count;
+	}
+	public void setCount(int value) {
+		this.count = value;
+	}
+}