Update /tools/README.md.
Update /tools/README.md.

Signed-off-by: linzhinan <dcaf8624321f9dc0e5d38c2534fb14e619ae2d49@huawei.com>

wking/rkt-oci,wangkirin/oct,huawei-openlab/oct,zenlinTechnofreak/oct,liangchenye/oct