example-top-down-unity/Assets/Scripts/Inventory/ResourceItem.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[CreateAssetMenu(fileName = "ResourceItem", menuName = "Items/ResourceItem", order = 2)]
public class ResourceItem : Item
{
    public override void OnSelect()
    {
        throw new System.NotImplementedException();
    }
}