add mac install instructions

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (8d8a79c) to head (502ebcf). Report is 2 commits behind head on staging.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## staging #2468 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 321 321 Lines 6269 6269 ========================================= Hits 6269 6269 ```

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[coveralls]

Pull Request Test Coverage Report for Build 180b4401-7dcb-4c24-bfc1-e3941b02091e

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.817%

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Totals
Change from base Build 200088bb-c86f-49bf-b8d3-c423a8c217ee:	0.0%
Covered Lines:	24778
Relevant Lines:	24780

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💛 - Coveralls