Map controllers to program.cs file.

http://localhost:5072/api/teams

EntityFrameworkCore.API/Program.cs

@@ -1,8 +1,12 @@
 using EntityFrameworkCore.Data;
 using Microsoft.EntityFrameworkCore;
 
+using EntityFrameworkCore.API.Controllers;
+
 var builder = WebApplication.CreateBuilder(args);
 
+builder.Services.AddControllers();
+
 // Add services to the container.
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddOpenApi();
@@ -36,5 +40,6 @@ if (app.Environment.IsDevelopment())
 
 app.UseHttpsRedirection();
 
+app.MapControllers();
 
 app.Run();