code: public void addComputeNodeUser(String poolId, String nodeId, ComputeNodeUser user) throws BatchErrorException, IOException {
          addComputeNodeUser(poolId, nodeId, user, null);
      }
docs: Adds a user account to the specified compute node.
  
  @param poolId The ID of the pool that contains the compute node.
  @param nodeId The ID of the compute node where the user account will be created.
  @param user The user account to be created.
  @throws BatchErrorException Exception thrown when an error response is received from the Batch service.
  @throws IOException Exception thrown when there is an error in serialization/deserialization of data sent to/received from the Batch service.