Val: Create tests/README.md with usability notice (#358)

* Create README.md with usability notice

Signed-off-by: Mateusz Grabuszyński <[email protected]>

* Update README.md

Corrections from copilot for clarity

Signed-off-by: KarolinaPomian <[email protected]>

* Style: tests/README.md

Co-authored-by: Copilot <[email protected]>
Signed-off-by: Mateusz Grabuszyński <[email protected]>

---------

Signed-off-by: Mateusz Grabuszyński <[email protected]>
Signed-off-by: KarolinaPomian <[email protected]>
Co-authored-by: KarolinaPomian <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: 3 people

tests/README.md

@@ -0,0 +1,11 @@
+# Usability Notice
+
+The data contained within the `tests` folder MUST NOT be used as a reference or guide for any external development.
+
+Please note that this folder may contain code or instructions that:
+- Are not up to date with the main branch or any other branch (even when present on that branch),
+- Use undocumented or deprecated features,
+- Access parts of the codebase that are not exposed in the API and should be treated as private,
+- Employ workarounds.
+
+None of the above shall be considered contrary to the terms of the provided [license](../LICENSE.md).