chore: import Musify.WebApi into monorepo (preserving history)

git-subtree-dir: Musify.WebApi
git-subtree-mainline: 9d433868cc
git-subtree-split: ca8750c3b4

Musify.WebApi/WebApi/OpenApi/OpenApiExtensions.cs

@@ -0,0 +1,14 @@
+using Microsoft.AspNetCore.OpenApi;
+
+namespace WebApi.OpenApi;
+
+public static class OpenApiExtensions
+{
+    public static IServiceCollection AddOpenApiConfiguration(this IServiceCollection services)
+    {
+        services.AddOpenApi();
+        services.ConfigureOptions<OpenApiOptionsSetup>();
+
+        return services;
+    }
+}