Added texture cache and sprite origins.

AlientAttack.MonoGame/Textures/TextureCache.cs

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+using Microsoft.Xna.Framework.Content;
+using Microsoft.Xna.Framework.Graphics;
+using System.Collections.Generic;
+
+namespace AlienAttack.MonoGame.Textures;
+
+public sealed class TextureCache
+{
+    private readonly Dictionary<string, Texture2D> _cache = [];
+    private ContentManager _content = default!;
+
+    public void Initialize(ContentManager content) => _content = content;
+
+    public Texture2D Get(string assetName)
+    {
+        if (_cache.TryGetValue(assetName, out var texture))
+            return texture;
+
+        texture = _content.Load<Texture2D>(assetName);
+        _cache[assetName] = texture;
+
+        return texture;
+    }
+
+    public void Clear() => _cache.Clear();
+}

AlientAttack.MonoGame/Textures/TextureId.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AlienAttack.MonoGame.Textures;
+
+//public enum TextureId
+//{
+//    LaserBulletSmall,
+//    LaserBulletMedium,
+//    LaserBulletLarge,
+//    MinigunBulletSmall,
+//    LaserBulletMedium,
+//    LaserBulletLarge,
+//    LaserBulletSmall,
+//    LaserBulletMedium,
+//    LaserBulletLarge,
+//    LaserBulletSmall,
+//    LaserBulletMedium,
+//    LaserBulletLarge,
+//}
+
+public static class TextureNames
+{
+    public static class Bullets
+    {
+        public const string LaserSmall = "Sprites/Laser_Small";
+        public const string LaserMedium = "Sprites/Laser_Medium";
+        public const string LaserLarge = "Sprites/Laser_Large";
+        public const string MinigunSmall = "Sprites/Minigun_Small";
+        public const string MinigunMedium = "Sprites/Minigun_Medium";
+        public const string MinigunLarge = "Sprites/Minigun_Large";
+        public const string PlasmaSmall = "Sprites/Plasma_Small";
+        public const string PlasmaMedium = "Sprites/Plasma_Medium";
+        public const string PlasmaLarge = "Sprites/Plasma_Large";
+        public const string ProtonSmall = "Sprites/Proton_Small";
+        public const string ProtonMedium = "Sprites/Proton_Medium";
+        public const string ProtonLarge = "Sprites/Proton_Large";
+    }
+}