createGroup 
  inline suspend fun IamClient.createGroup(crossinline block: CreateGroupRequest.Builder.() -> Unit): CreateGroupResponse
Creates a new group.
For information about the number of groups you can create, see IAM and STS quotas in the IAM User Guide.
Samples
fun main() { 
   //sampleStart 
   // The following command creates an IAM group named Admins.
val resp = iamClient.createGroup {
    groupName = "Admins"
} 
   //sampleEnd
}