Add "libomp" library dependency in macOS environments.

Author: dieriver

README.md

@@ -102,7 +102,7 @@ Before proceeding with the SimulaQron install, you need to install python 3.12,
 3.12 using the following command:
 
 ```shell
-brew install python@3.12
+brew install python@3.12 libomp
 ```
 
 Additionally, to install the optional dependencies, you will need to install *XCode Command Line Tools*. To do

docs/Troubleshooting.rst

@@ -411,4 +411,7 @@ can also instruct pip to compile Qutip with the older toolchain::
 
        $ pip install projectq qutip --index-url https://gitlab.tudelft.nl/api/v4/projects/28442/packages/pypi/simple
 
+    **In macOS, these packages are compiled only for macOS 26 (Tahoe)**. Additionally, they require installing "libomp"
+    from homebrew: ``brew install libomp``.
+
 Then you can try to install simulaqron with optional dependencies again.