Created blog post for 4.2.0 final

docs/en/Blog-Posts/2021-01-28 v4_2_Release_Stable/POST.md

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+# ABP.IO Platform 4.2 Final Has Been Released!
+
+[ABP Framework](https://abp.io/) and [ABP Commercial](https://commercial.abp.io/) 4.2 versions have been released today.
+
+## What's New With 4.2?
+
+Since all the new features are already explained in details with the [4.2 RC Announcement Post](https://blog.abp.io/abp/ABP-IO-Platform-v4-2-RC-Has-Been-Released), I will not repeat all the details again. See the [RC Blog Post](https://blog.abp.io/abp/ABP-IO-Platform-v4-2-RC-Has-Been-Released) for all the features and enhancements.
+
+## Creating New Solutions
+
+You can create a new solution with the ABP Framework version 4.2 by either using the `abp new` command or using the **direct download** tab on the [get started page](https://abp.io/get-started).
+
+> See the [getting started document](https://docs.abp.io/en/abp/latest/Getting-Started) for details.
+
+## How to Upgrade an Existing Solution
+
+### Install/Update the ABP CLI
+
+First of all, install the ABP CLI or upgrade to the latest version.
+
+If you haven't installed yet:
+
+```bash
+dotnet tool install -g Volo.Abp.Cli
+```
+
+To update an existing installation:
+
+```bash
+dotnet tool update -g Volo.Abp.Cli
+```
+
+### ABP UPDATE Command
+
+[ABP CLI](https://docs.abp.io/en/abp/latest/CLI) provides a handy command to update all the ABP related NuGet and NPM packages in your solution with a single command:
+
+```bash
+abp update
+```
+
+Run this command in the root folder of your solution.
+
+## Migration Guide
+
+Check [the migration guide](https://docs.abp.io/en/abp/4.2/Migration-Guides/Abp-4_2) for the applications with the version 4.x upgrading to the version 4.2.
+
+> It is strongly recommended to check the migration guide for this version. Especially, the new `IRepository.GetQueryableAsync()` method is a core change should be considered after upgrading the solution.
+
+## About the Next Version
+
+The next feature version will be 4.3. It is planned to release the 4.3 RC (Release Candidate) on March 11 and the final version on March 25, 2021.
+
+We decided to slow down the feature development for the [next milestone](https://github.com/abpframework/abp/milestone/49). We will continue to improve the existing features and introduce new ones, sure, but wanted to have more time for the planning, documentation, creating guides and improving the development experience.