Added install_docker in simple-steem-docker

I've added installer_docker to https://github.com/doctorlai/simple-steem-docker

https://github.com/DoctorLai/simple-steem-docker/pull/17/files

install_docker() {
    if ! command -v docker &> /dev/null; then
        echo "Docker not found. Installing Docker..."
        curl -fsSL https://get.docker.com -o ~/get-docker.sh
        sh ~/get-docker.sh
        rm ~/get-docker.sh
        echo "Docker installed successfully."
    else
        echo "Docker is already installed."
    fi
}

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