Initial 4.0 blog post

docs/en/Blog-Posts/2020-11-12 v4_0_Preview/POST.md

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+# ABP Framework 4.0 RC Has Been Published based on .NET 5.0!
+
+Today, we have released the [ABP Framework](https://abp.io/) (and the [ABP Commercial](https://commercial.abp.io/)) `4.0.0-rc.1` that is based on the .NET 5.0. This blog post introduces the new features and important changes in the new version.
+
+> **The planned release date for the [4.0.0 final](https://github.com/abpframework/abp/milestone/45) version is November 26, 2020**.
+
+## Get Started with the 4.0 RC.1
+
+If you want to try the version `4.0.0-rc.1` today, follow the steps below;
+
+1) **Upgrade** the ABP CLI to the version `4.0.0-rc.1` using a command line terminal:
+
+````bash
+dotnet tool update Volo.Abp.Cli -g --version 4.0.0-rc.1
+````
+
+**or install** if you haven't installed before:
+
+````bash
+dotnet tool install Volo.Abp.Cli -g --version 4.0.0-rc.1
+````
+
+2) Create a **new application** with the `--preview` option:
+
+````bash
+abp new BookStore --preview
+````
+
+See the [ABP CLI documentation](https://docs.abp.io/en/abp/3.3/CLI) for all the available options.
+
+> You can also use the *Direct Download* tab on the [Get Started](https://abp.io/get-started) page by selecting the **Preview checkbox**.
+
+## Migrating From 3.x to 4.0
+
+The version 4.0 comes with some major changes including the migration from .NET Core 3.1 to .NET 5.0.
+
+We've prepared a detailed [migration document](https://docs.abp.io/en/abp/4.0/Migration-Guides/Abp-4_0) to explain all the changes and the actions you need to take while upgrading your existing solutions.
+
+## What's new with the ABP Framework 4.0
+
+### The Blazor UI
+
+The Blazor UI is now stable and officially supported.
+
+#### Breaking Changes on the Blazor UI
+
+TODO
+
+## What's new with the ABP Commercial 3.3
+
+TODO
+
+## About the Next Release
+
+The next feature version, `4.1.0`, will mostly focus on completing the missing documents, fixing bugs, performance optimizations and improving the Blazor UI features. The planned preview release date for the version `4.1.0` is December 10 and the final (stable) version release date is December 24.
+
+Follow the [GitHub milestones](https://github.com/abpframework/abp/milestones) for all the planned ABP Framework version release dates.
+
+## Feedback
+
+Please check out the ABP Framework 4.0.0 RC and [provide feedback](https://github.com/abpframework/abp/issues/new) to help us to release a more stable version. **The planned release date for the [4.0.0 final](https://github.com/abpframework/abp/milestone/45) version is November 26**.