Resolved #6862: Tenant Management documentation

docs/en/Modules/Tenant-Management.md

@@ -1,3 +1,56 @@
 # Tenant Management Module
 
-TODO
+[Multi-Tenancy](../Multi-Tenancy.md) is one of the core features of ABP Framework. It provides the fundamental infrastructure to build your own SaaS (Software-as-a-Service) solution. ABP's multi-tenancy system abstracts where your tenants are stored, by providing the `ITenantStore` interface. All you need to do is to implement that interface.
+
+**The Tenant Management module is an implementation of the the `ITenantStore` interface. It stores tenants in a database. It also provides UI to manage your tenants and their [features](../Features.md).**
+
+> Please **refer to the [Multi-Tenancy](../Multi-Tenancy.md) documentation** to understand the multi-tenancy system of the ABP Framework. This document focuses on the Tenant Management module.
+
+### About the ABP Commercial SaaS Module
+
+The [SaaS Module](https://commercial.abp.io/modules/Volo.Saas) is an alternative implementation of this module with more features and possibilities. It is distributed as a part of the [ABP Commercial](https://commercial.abp.io/) subscription.
+
+## How to Install
+
+This module comes as pre-installed (as NuGet packages) when you [create a new solution](https://abp.io/get-started) with the ABP Framework. You can continue to use it via NuGet packages and get updates easily, or you can include its source code into your solution (see `get-source` [CLI](../CLI.md) command) to develop your custom module.
+
+## User Interface
+
+This module adds "*Administration -> Tenant Management -> Tenants*" menu item to the main menu of the application, which opens the page shown below:
+
+![module-tenant-management-page](../images/module-tenant-management-page.png)
+
+In this page, you see the all the tenants. You can create a new tenant as shown below:
+
+![module-tenant-management-new-tenant](../images/module-tenant-management-new-tenant.png)
+
+In this modal;
+
+* **Name**: The unique name of the tenant. If you use subdomains for your tenants (like https://some-tenant.your-domain.com), this will be the subdomain name.
+* **Admin Email Address**: Email address of the admin user for this tenant.
+* **Admin Password**: The password of the admin user for this tenant.
+
+When you click to *Actions* button near to a tenant, you will see the actions you can take:
+
+![module-tenant-management-actions](../images/module-tenant-management-actions.png)
+
+### Managing the Tenant Features
+
+The Features action opens a modal to enable/disable/set [features](../Features.md) for the related tenant. Here, an example modal:
+
+![features-modal](../images/features-modal.png)
+
+### Managing the Host Features
+
+*Manage Host features* button is used  to set features for the host side, if you use the features of your application also in the host side.
+
+## Internals
+
+This section can be used as a reference if you want to [customize](../Customizing-Application-Modules-Guide.md) this module without changing it source code.
+
+*TODO: Internals*
+
+## See Also
+
+* [Multi-Tenancy](../Multi-Tenancy.md)
+* [ABP Commercial SaaS Module](https://docs.abp.io/en/commercial/latest/modules/saas)