Add mac portability experiment

Author: Petingo

portability_experiment/README.md

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+# Experiment on Mac
+1. Install diffCheck library (replace <user_name> with your user name)
+```
+/Users/<user_name>/.rhinocode/py39-rh8/python3.9 -m pip install diffcheck-1.3.0-py3-none-any.whl --force-reinstal
+```
+
+2. Open the `subtractive_gh_v1_mac_portability.gh` file, the expected result would be:
+![](./expected_result.png)
+
+There should be no error before the Segmentation.

portability_experiment/diffcheck-1.3.0-py3-none-any.whl

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8c4cf8ce2c1eac0731904d5479b51b93de789ba412886460c17f4c41decd8291
+size 45841707