Added the OpenRouter provider (#595)

app/MindWork AI Studio/Provider/OpenRouter/OpenRouterModel.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Provider.OpenRouter;
+
+/// <summary>
+/// A data model for an OpenRouter model from the API.
+/// </summary>
+/// <param name="Id">The model's ID.</param>
+/// <param name="Name">The model's human-readable display name.</param>
+public readonly record struct OpenRouterModel(string Id, string? Name);