static void Main()
{
var optionsBuilder = new DbContextOptionsBuilder <CrowdDbContext>();
optionsBuilder.UseSqlServer(CrowdDbContext.ConnectionString);
using CrowdDbContext db = new CrowdDbContext(optionsBuilder.Options);
IPackageManager projectMngr = new PackageManagement(db);
var list = projectMngr.BackerRewards(3);
IProjectManager project = new ProjectManagement(db);
int c = project.PagesNum();
}