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Add CODEOWNERS file in .github/CODEOWNERS #227

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Job	Run time
go-fmt-and-vet	17s
go-test (1.19, x32)	3m 23s
go-test (1.19, x64)	2m 51s
go-test (1.20, x32)	3m 20s
go-test (1.20, x64)	3m 4s
go-test-compat (1.20, x32)	1m 38s
go-test-compat (1.20, x64)	1m 31s
go-test-compat (1.21, x32)	1m 43s
go-test-compat (1.21, x64)	16s
go-test-compat (1.22, x32)	1m 50s
go-test-compat (1.22, x64)	12s
	20m 5s