Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace OrchardCoreExample.Application.WebHost
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddOrchardCms();
            services.Configure<IdentityOptions>(options =>
            {
                options.Password.RequireDigit = false;
                options.Password.RequireLowercase = false;
                options.Password.RequireUppercase = false;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequiredUniqueChars = 3;
                options.Password.RequiredLength = 6;
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseStaticFiles();

            app.UseOrchardCore();
        }
    }
}