doc: add CODEOWNERS #449

Job	Run time
tests (vmm/sandbox, --all-features)	5m 10s
tests (vmm/task, --all-features)	4m 9s
tests (shim, --all-features)	4m 54s
tests (quark, --all-features)	5m 31s
tests (wasm, --features=wasmedge, 0.11.2)	5m 14s
tests (wasm, --features=wasmtime)	6m 43s
checks (vmm/sandbox, --all-features)	8m 7s
checks (vmm/task, --all-features)	7m 15s
checks (shim, --all-features)	7m 16s
checks (quark, --all-features)	7m 59s
checks (wasm, --features=wasmedge, 0.11.2)	8m 37s
checks (wasm, --features=wasmtime)	8m 33s
	1h 19m 28s

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