Login as root and ...
# create new user
useradd hocvt
# change pass
passwd hocvt
# add to sudoer
usermod -aG wheel hocvt
# login to created user
su hocvt
# goto home
cd ~
# create .ssh folder
mkdir .ssh
# change mod (required by sshd see https://wiki.centos.org/HowTos/Network/SecuringSSH heading 7th)
chmod 700 .ssh
cd .ssh/
# create authorized_keys file
vim authorized_keys
# .... paste your public key and save
# chmod
chmod 600 authorized_keys
# Done