feat: initial project commit

src/Result/Errors/AggregateError.cs

@@ -0,0 +1,16 @@
+namespace Geekeey.Extensions.Result;
+
+/// <summary>
+/// An error which is a combination of other errors.
+/// </summary>
+/// <param name="errors">The errors the error consists of.</param>
+public sealed class AggregateError(IEnumerable<Error> errors) : Error
+{
+	/// <summary>
+	/// The errors the error consists of.
+	/// </summary>
+	public IReadOnlyCollection<Error> Errors { get; } = errors.ToList();
+
+	/// <inheritdoc/>
+	public override string Message => string.Join(Environment.NewLine, Errors.Select(error => error.Message));
+}