where to find trirand web.ui.controls

http://trirandcore.azurewebsites.net/demo/grid

using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;using Trirand.Web.Core;

namespace CoreDemo.Models
{
    public class OrdersJqGridModel
    {
        public CoreGrid OrdersGrid { get; set; }

        public OrdersJqGridModel(HttpContext context)
        {

Was trying to work with Jqgrid in .net core how to install the packge using Trirand.Web.Core; is not given in http://trirandcore.azurewebsites.net/demo/grid.