[TASK] Add missing rst file for testing framework removal

Change-Id: I6ae49dd73c4ded8d6b1572c79d03ce48108d3957
Resolves: #80606
Releases: master
Reviewed-on: https://review.typo3.org/52304


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Documentation/Changelog/master/Important-80606-TestingFrameworkRemovalUseComposerPackageInstead.rst

+.. include:: ../../Includes.txt
+
+============================================================================
+Important: #80606 - Testing Framework Removal / Use composer package instead
+============================================================================
+
+See :issue:`80606`
+
+Description
+===========
+
+The TYPO3 core base testing classes were moved to a separate composer package and removed
+from the TYPO3 core. If you want to continue using the testing framework classes please use
+composer and require the package typo3/testing-framework.
+
+To make sure you don't run into path issues, you can set the following environment variables:
+TYPO3_PATH_WEB = The path to your web root
+TYPO3_PATH_PACKAGES = The path to your vendor folder
+
+Find the new package on github at:
+https://github.com/TYPO3/testing-framework
+
+And on packagist:
+https://packagist.org/packages/typo3/testing-framework
+
+.. index:: CLI, PHP-API
\ No newline at end of file