Add notes about common cuBIDS errors we run into and what they mean

[LuciMoore]

Here are just a few quick notes, they could use polish and checks for accuracy:

• BOLD_NOT_4D and NIFTI_PIXDIM4 (usually same subject lists)- for func runs - likely means the func run only has 1 volume. these aren't usable and should be removed from the BIDS inputs
• INCONSISTENT_PARAMETERS - func runs - sometimes this just means that not all the func runs have the same number of frames for example, which isn't unusual and can be ignored
• INTENDED_FOR - could mean that the json is missing, the IF field is blank, the file path in the IF field isn't accurate (I believe it should be formatted as ses-XXX/func/run1.nii.gz for example starting at session level), etc
• PHASE_ENCODING_DIRECTION_MUST_DEFINE & TOTAL_READOUT_TIME_MUST_DEFINE - could either mean that these fields are missing or blank in the jsons, or that the json files themselves are missing
• VOLUME_COUNT_MISMATCH - I don't remember this one off the top of my head. might mean something is wrong with dwi file and it should be discarded similar to BOLD_NOT_4D for func runs