To create an Amazon VPC using AWS CLI, you need to first configure AWS (assuming you already have AWS CLI installed)
To configure simply use the following command:-
C:\Users\priyj_kumar>aws configure
AWS Access Key ID [****************PO6Y]: 
AWS Secret Access Key [****************P6Vo]: 
Default region name [us-east-1]:
Default output format [None]:
Now your account is configured. To create a VPC (blank) use the following command:-
C:\Users\priyj_kumar>aws ec2 create-vpc --cidr-block 10.0.0.0/16
This will result in the Output giving you the necessary details about your VPC.
{
    "Vpc": {
        "CidrBlock": "10.0.0.0/16",
        "DhcpOptionsId": "dopt-d6bc32ad",
        "State": "pending",
        "VpcId": "vpc-0a1a117b2e6c8e09b",
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": [],
        "CidrBlockAssociationSet": [
            {
                "AssociationId": "vpc-cidr-assoc-044572a6755a02354",
                "CidrBlock": "10.0.0.0/16",
                "CidrBlockState": {
                    "State": "associated"
                }
            }
        ],
        "IsDefault": false,
        "Tags": []
    }
}
This way you can create an Amazon VPC.