Allow user to specify parameters to check compliance for

[sinhaharsh]

As of now, there is a dictionary in MRdataset/config.py which stores the different parameters which are extracted from the DICOM header. Although it is possible to extend the dictionary as per the needs of the user, it would be even better if there is a CLI option to specify what parameters to check compliance for?

• Should we include a separate json/yaml file to read the list of parameters?
• We would need to DICOM tag associated with the particular parameter to read it from the header. What if the user is not aware of the tag? Can we accommodate it?
• How can we incorporate custom tags?