First couple abilities implemented

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/Berserk.cs

@@ -0,0 +1,21 @@
+namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
+
+[Script(ScriptCategory.Ability, "berserk")]
+public class Berserk : Script
+{
+    /// <inheritdoc />
+    public override void OnDamage(IPokemon pokemon, DamageSource source, uint oldHealth, uint newHealth)
+    {
+        if (source is not DamageSource.MoveDamage)
+            return;
+        if (oldHealth > pokemon.MaxHealth / 2 || newHealth > pokemon.MaxHealth / 2)
+            return;
+
+        EventBatchId batchId = new();
+        pokemon.BattleData?.Battle.EventHook.Invoke(new AbilityTriggerEvent(pokemon)
+        {
+            BatchId = batchId,
+        });
+        pokemon.ChangeStatBoost(Statistic.SpecialAttack, 1, true, batchId);
+    }
+}