add: funcionalidades REST

Program.cs

@@ -1,10 +1,12 @@
 // Note: repository implementation removed for workshop exercise (TODOs in project files)
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Mvc;
+using CampusWorkshops.Api.Repositories;
 
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services
+builder.Services.AddSingleton<IWorkshopRepository, InMemoryWorkshopRepository>();
 builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen(o =>