Initial set up for item use

Plugins/PkmnLib.Plugin.Gen7/Scripts/Items/HealingItem.cs

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+using System.Collections.Generic;
+using PkmnLib.Dynamic.Models;
+using PkmnLib.Dynamic.ScriptHandling;
+using PkmnLib.Dynamic.ScriptHandling.Registry;
+using PkmnLib.Static.Utils;
+
+namespace PkmnLib.Plugin.Gen7.Scripts.Items;
+
+[ItemScript("healing_item")]
+public class HealingItem : ItemScript
+{
+    private uint _healAmount;
+
+    /// <inheritdoc />
+    public override bool IsItemUsable => true;
+
+    /// <inheritdoc />
+    public override bool RequiresTarget => true;
+
+    /// <inheritdoc />
+    public override void OnInitialize(IReadOnlyDictionary<StringKey, object?>? parameters)
+    {
+        if (parameters == null || !parameters.TryGetValue("heal_amount", out var healAmountObj) ||
+            healAmountObj is not int healAmount)
+        {
+            healAmount = 20;
+        }
+
+        _healAmount = (uint)healAmount;
+    }
+
+    /// <inheritdoc />
+    public override bool IsTargetValid(IPokemon target) => !target.IsFainted;
+
+    /// <inheritdoc />
+    public override void OnUseWithTarget(IPokemon target)
+    {
+        target.Heal(_healAmount);
+    }
+}