feat(`ci`): add & enable ci/cd #8

Job	Run time
docs	28s
feature checks	1m 45s
clippy	38s
test no default features (ubuntu-latest)	1m 2s
test default features (ubuntu-latest)	1m 30s
fmt	18s
test all features (ubuntu-latest)	2m 29s
test no default features (macos-latest)	1m 26s
test default features (macos-latest)	2m 9s
test all features (macos-latest)	3m 26s
test no default features (windows-latest)	5m 50s
test default features (windows-latest)	3m 28s
test all features (windows-latest)	7m 0s
	31m 29s

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