feat: initial project commit

src/Results/Errors/InvalidOperationError.cs

@@ -0,0 +1,11 @@
+namespace Geekeey.Common.Results;
+
+/// <summary>
+/// An error which represents an invalid operation.
+/// </summary>
+/// <param name="message">An optional message describing the operation and why it is invalid.</param>
+public sealed class InvalidOperationError(string? message = null) : Error
+{
+	/// <inheritdoc/>
+	public override string Message => message ?? "Invalid operation.";
+}