Add singularity armor, multitool and rarity

Content/Rarities/SingularityItem.cs

@@ -0,0 +1,11 @@
+using Terraria.ModLoader;
+using Terraria;
+using Microsoft.Xna.Framework;
+
+namespace ForgottenWawiTech.Content.Rarities
+{
+    public class SingularityItem : ModRarity
+    {
+        public override Color RarityColor => new Color(140, 0, 128); // Dark reddish-purple color
+    }
+}