docs: added ray 2d comments

Engine.Core/Primitives/Ray2D.cs

@@ -1,5 +1,10 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents an infinite ray in 2D space.
+/// </summary>
+/// <param name="Origin">The <see cref="Vector2D"/> in 2D space where the ray starts from.</param>
+/// <param name="Direction">Normalized <see cref="Vector2D"/> indicating the ray's is direction.</param> 
 public readonly struct Ray2D(Vector2D Origin, Vector2D Direction)
 {
     /// <summary>