Create empty entities for the Coupons module

plugins/Coupons/src/EasyAbp.EShop.Plugins.Coupons.Domain/EasyAbp/EShop/Plugins/Coupons/CouponTemplates/CouponTemplate.cs

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+using System;
+using Volo.Abp.Domain.Entities.Auditing;
+using Volo.Abp.MultiTenancy;
+
+namespace EasyAbp.EShop.Plugins.Coupons.CouponTemplates
+{
+    public class CouponTemplate : FullAuditedAggregateRoot<Guid>, IMultiTenant
+    {
+        public virtual Guid? TenantId { get; protected set; }
+    }
+}

plugins/Coupons/src/EasyAbp.EShop.Plugins.Coupons.Domain/EasyAbp/EShop/Plugins/Coupons/CouponTemplates/CouponTemplateProduct.cs

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+using System;
+using Volo.Abp.Domain.Entities.Auditing;
+
+namespace EasyAbp.EShop.Plugins.Coupons.CouponTemplates
+{
+    public class CouponTemplateProduct : FullAuditedEntity<Guid>
+    {
+    }
+}

plugins/Coupons/src/EasyAbp.EShop.Plugins.Coupons.Domain/EasyAbp/EShop/Plugins/Coupons/Coupons/Coupon.cs

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+using System;
+using Volo.Abp.Domain.Entities.Auditing;
+using Volo.Abp.MultiTenancy;
+
+namespace EasyAbp.EShop.Plugins.Coupons.Coupons
+{
+    public class Coupon : FullAuditedAggregateRoot<Guid>, IMultiTenant
+    {
+        public virtual Guid? TenantId { get; protected set; }
+    }
+}