Add example link to Multi-Tenancy

https://github.com/abpframework/abp-samples/tree/master/DomainTenantResolver

docs/en/Multi-Tenancy.md

@@ -315,6 +315,8 @@ Configure<AbpTenantResolveOptions>(options =>
 * Add this code to the `ConfigureServices` method of your [module](Module-Development-Basics.md).
 * This should be done in the *Web/API Layer* since the URL is a web related stuff.
 
+> There is an [example](https://github.com/abpframework/abp-samples/tree/master/DomainTenantResolver) that uses the subdomain to determining the current tenant. 
+
 ##### Custom Tenant Resolvers
 
 You can add implement your custom tenant resolver and configure the `AbpTenantResolveOptions` in your module's `ConfigureServices` method as like below:
@@ -407,4 +409,4 @@ The [Tenant Management module](Modules/Tenant-Management.md) provides a basic UI
 
 ## See Also
 
-* [Features](Features.md)
+* [Features](Features.md)