Added workflows to test Linux, Windows, and Mac builds. #34

All 14 440 tests pass in 3m 18s

14 440 tests ±0 14 440 ✔️ ±0 3m 18s ⏱️ - 2m 16s
        1 suites ±0         0 💤 ±0
        1 files ±0         0 ❌ ±0

Results for commit 6feefa9. ± Comparison against earlier commit e2128e8.