add benchmark for MacBook Air M1 - 8 Cores - 16GB RAM - 256GB SSD

[junessi]

Checklist

If you have any non-Apple hardware components - submit your results to the Custom Hardware table.

• [ x I performed all steps to correctly run XcodeBenchmark.
• [ x ] I used Xcode 12.5 or above.
• [ x ] I attached a screenshot with a compilation time and other fields, example.
• [ x ] I confirm that Time column is still sorted.
• [ x ] The content in cells is centered.