Merge pull request #13425 from abpframework/gterdem/migration_guide_6_0

ABP Migration Guide 6.0

docs/en/Migration-Guides/Abp-6_0.md

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+# ABP Version 6.0 Migration Guide
+
+This document is a guide for upgrading ABP v5.3 solutions to ABP v6.0. There is a change in this version that may affect your applications, please read it carefully and apply the necessary changes to your application.
+
+## Added IsActive property
+
+`IsActive` property is added to `IUserData`. This property is set to **true** by default. **Cmskit** and **Blog** modules are affected by this change. You need to add new migration to your existing application if you are using any of these modules. Please see [#11417](https://github.com/abpframework/abp/pull/11417) for more info.
+
+## Default behavior change in MultiTenancyMiddlewareErrorPageBuilder
+
+If you have customized the `MultiTenancyMiddlewareErrorPageBuilder` of `AbpMultiTenancyOptions`, the pipeline now returns **true** to stop the pipeline as the default behavior. See [AbpMultiTenancyOptions: Handle inactive and non-existent tenants](https://github.com/abpframework/abp/blob/dev/docs/en/Multi-Tenancy.md#abpmultitenancyoptions-handle-inactive-and-non-existent-tenants) for more info.
+
+## Migrating to LeptonX Lite
+
+LeptonX Lite is now being introduced and you can follow the guides below to migrate your existing applications:
+
+- [Migrating to LeptonX MVC UI](../themes/LeptonXLite/AspNetCore.md)
+- [Migrating to LeptonX Angular UI](../themes/LeptonXLite/angular.md)
+- [Migrating to LeptonX Blazor UI](../themes/LeptonXLite/blazor.md)
+
+## Migrating to OpenIddict
+
+After the [announcement of plan to replace the IdentityServer](https://github.com/abpframework/abp/issues/11989), we have successfully implemented [Openiddict](https://github.com/openiddict/openiddict-core) as a replacement for IdentityServer4 as OpenID-Provider. You can follow [Migrating Identity Server to OpenIddict guide](./IdentityServer_To_OpenIddict.md).
+
+## See Also
+
+* [Official blog post for the 6.0 release](https://blog.abp.io/abp/ABP.IO-Platform-6.0-RC-Has-Been-Published)

docs/en/Migration-Guides/Index.md

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 The following documents explain how to migrate your existing ABP applications. We write migration documents only if you need to take an action while upgrading your solution. Otherwise, you can easily upgrade your solution using the [abp update command](../Upgrading.md).
 
+- [5.3 to 6.0](Abp-6_0.md)
 - [5.2 to 5.3](Abp-5_3.md)
 - [5.1 to 5.2](Abp-5_2.md)
 - [4.x to 5.0](Abp-5_0.md)