Updating CONTRIBUTING.md with PROW commands and adding OWNERS file #392

Job	Run time
spell check with typos	3s
docs-pr	2s
build-on-windows (windows-debug)	48s
build-on-linux (linux-kvm-debug)	57s
build-on-windows (windows-release)	1m 0s
build-on-linux (linux-kvm-release)	57s
build-on-linux (linux-hyperv-debug)	1m 39s
build-on-linux (linux-hyperv-release)	53s
fuzzing / fuzz	8m 48s
rust / build (hyperv, amd, debug)	15m 52s
rust / build (hyperv, amd, release)	21m 30s
rust / build (hyperv, intel, debug)	15m 39s
rust / build (hyperv, intel, release)	20m 47s
rust / build (mshv, amd, debug)	9m 37s
rust / build (mshv, amd, release)	13m 12s
rust / build (mshv, intel, debug)	8m 46s
rust / build (mshv, intel, release)	12m 43s
rust / build (kvm, amd, debug)	10m 10s
rust / build (kvm, amd, release)	13m 8s
rust / build (kvm, intel, debug)	8m 41s
rust / build (kvm, intel, release)	12m 32s
	2h 57m 44s

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