public async Task <Product> CreateAsync(Product entity)
        {
            var res = await ctx.Products.AddAsync(entity);

            await ctx.SaveChangesAsync();

            return(res.Entity);
        }
        public async Task <Category> CreateAsync(Category entity)
        {
            var res = await ctx.Categories.AddAsync(entity);

            await ctx.SaveChangesAsync();

            return(res.Entity);
        }