Update README.md for 8.15.0 as part of move to closed source model (#12529)

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+# Vaadin 7 extended maintenance version changelog
+
+## Vaadin 7.7.30
+
+* Ensure resize and dragging curtains are removed when a window is closed

diff --git a/CHANGELOG-VAADIN8.md b/CHANGELOG-VAADIN8.md
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+# Vaadin 8 extended maintenance version changelog
+
+## Vaadin 8.15.0
+
+* Change license from Apache 2.0 to CVDLv4
+* Add more intuitive resynchronization error message
+* fix: Allow scrolling away from a Grid using touch
+* fix: Throw exception when attempting to merge BeanPropertySets with identical keys but different value types

diff --git a/README.md b/README.md
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 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/vaadin/framework-8?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
+
 # Vaadin Framework
 
 *[Vaadin](https://vaadin.com) allows you to build modern web apps efficiently in plain Java, without touching low level web technologies.*
 
 This repository contains source code and issue tracking for Vaadin 8 and Vaadin 7, both of which use GWT as the base of client-side implementations. You can find source code and issue tracking for newer, web component based Vaadin versions in [vaadin/platform](https://github.com/vaadin/platform).
 
-Vaadin 8 includes Vaadin 7 compatibility classes and is supported until February 21, 2022 (extended support will be available for ten years after that).
+Vaadin 8 includes Vaadin 7 compatibility classes. The source code in this repository is (and will always be) available under Apache License 2.0, but Vaadin Framework 7 and 8 are now being maintained under a closed-source model by the Vaadin Expertise Team. You are free to continue using Vaadin Framework releases up to [8.14.3](https://github.com/vaadin/framework/releases/tag/8.14.3) and [7.7.17](https://github.com/vaadin/framework/releases/tag/7.7.17), and you are free to fork and maintain the framework yourself.
+
+Vaadin 8 open source maintenance ended in February 2022, [extended support](https://vaadin.com/support/vaadin-8-extended-maintenance) is available until February 2032. Starting with version 8.15.0, Vaadin 8 is subject to CVDLv4.
+
+Vaadin 7 open source maintenance ended in Febraury 2019, [extended support](https://vaadin.com/support/vaadin-7-extended-maintenance) is available until February 2029. Starting with version 7.8.0, Vaadin 7 is subject to CVDLv4.
+
+
+## Changelog
+
+For a changelog of Vaadin 8 starting with 8.15.0, see the [Vaadin 8 Changelog](CHANGELOG-VAADIN8.md).
+
+For a changelog of Vaadin 7 starting with 7.7.30, see the [Vaadin 7 Changelog](CHANGELOG-VAADIN7.md).
 
-Vaadin 7 support has already ended, [extended support](https://vaadin.com/support/vaadin-7-extended-maintenance) is available until February 2029.
 
 ## Using Vaadin 8 to develop applications
 
@@ -16,11 +27,12 @@ Please refer to [Vaadin tutorial](https://vaadin.com/docs/v8/framework/tutorial.
 
 For known issues within Vaadin framework, see [Issue Tracker](https://github.com/vaadin/framework/issues). Comment or react to an existing issue to mark your interest in resolving it. If you don't find an existing report of an issue you are experiencing, [submit a new issue](https://github.com/vaadin/framework/issues/new/choose).
 
-## Contributing
 
-To contribute, first refer to [Contributing Code](CONTRIBUTING.md)
-for general instructions and requirements for contributing code to the Vaadin framework.
+## Developing Vaadin Framework
 
 For instructions on how to set up a working environment for developing the Vaadin framework, please visit [Development Instructions](README-DEV.md). Pay special attention to workspace preferences.
 
-We appreciate all contributors and want to make submitting changes as easy as possible. If you find any mistakes, unclear parts or out-of-date instructions, please let us know by submitting an issue or a pull request.
+
+## Contributing
+
+As of February 2022, this repository is used for issue tracking. Since we are no longer building releases from this repository, we are no longer accepting pull requests. You may file bug reports here against extended maintenance releases.