Assign storage policy

curl -X POST https://api.box.com/2.0/storage_policy_assignments \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H 'Content-Type: application/json" '
     -d '{
       "storage_policy": {
         "type": "storage_policy",
         "id": "1434325"
       },
       "assigned_to": {
         "type": "user",
         "id": "9987987"
       }
     }'

BoxStoragePolicyAssignment assignment = client.StoragePoliciesManager
    .CreateAssignmentAsync(userId: "22222", policyId: "6");

BoxStoragePolicyAssignment.Info assignmentInfo = BoxStoragePolicyAssignment.assign(api, "1234", "5678");

user = client.user(user_id='12345')
assignment = client.storage_policy(policy_id='56781').assign(user)
print('Assignment ID is {0} and the assignee id is {1}'.format(assignment.id,assignment.assigned_to.id))

client.storagePolicies.createAssignment('7', '22222')
    .then(assignment => {
        /* assignment -> {
            type: 'storage_policy_assignment',
            id: 'dXNlcl8yMjIyMg==',
            storage_policy: 'storage_policy', id: '7' },
            assigned_to: { type: 'user', id: '22222' } }
        */
    });

client.storagePolicy.assign(storagePolicyId: "1234", assignedToType: "user", assignedToId: "123") { (result: Result<StoragePolicyAssignment, BoxSDKError>) in
    guard case let .success(assignment) = result else {
        print("Error assigning a storage policy")
        return
    }
    print("Created storage policy assignment ID is \(assignment.id). The ID of the user it is assigned to \(assignment.assignedTo?.id)")
}