To create a Route Table for your VPC all you need to do is get the VPC Id and then create a route table in it.
To create a route table the command is:
C:\Users\priyj_kumar>aws ec2 create-route-table --vpc-id vpc-0aca683c37231c12f
This will give you the output as follows:-
{
    "RouteTable": {
        "Associations": [],
        "PropagatingVgws": [],
        "RouteTableId": "rtb-05f48298823c9731d",
        "Routes": [
            {
                "DestinationCidrBlock": "10.0.0.0/16",
                "GatewayId": "local",
                "Origin": "CreateRouteTable",
                "State": "active"
            }
        ],
        "Tags": [],
        "VpcId": "vpc-0aca683c37231c12f"
    }
}
This way you can create a Route Table in your VPC. Hope it helps.