Function create_security_group 

pub fn create_security_group(
    configuration: &Configuration,
    create_security_group_request: Option<CreateSecurityGroupRequest>,
) -> Result<CreateSecurityGroupResponse, Error<CreateSecurityGroupError>>

Creates a security group.
This action creates a security group either in the public Cloud or in a specified Net. By default, a default security group for use in the public Cloud and a default security group for use in a Net are created.
When launching a virtual machine (VM), if no security group is explicitly specified, the appropriate default security group is assigned to the VM. Default security groups include a default rule granting VMs network access to each other.
When creating a security group, you specify a name. Two security groups for use in the public Cloud or for use in a Net cannot have the same name.
You can have up to 500 security groups in the public Cloud. You can create up to 500 security groups per Net.
To add or remove rules, use the CreateSecurityGroupRule method.

For more information, see About Security Groups.