Restrict hdf5 instruction to macOS

Author: dpoznik

docs/setup.md

@@ -1,7 +1,7 @@
 ## Set Up Environment
 
 - Make sure you have `python >= 3.10` installed.
-- Make sure you have `hdf5` installed.
+- If using macOS, you may need to install `hdf5` (e.g., via `brew install hdf5`).
 - Install poetry: `pip install 'poetry>=1.8'`
 - Install the project dependencies: `poetry update`
 - Enter the virtual environment: `poetry shell`