Add documentation for JLD2 I/O
Addresses #3364
I have left some stylistic comments.
Additionally, since I am not using JLD2 format myself. The question is how does it handle saving SubDataFrame, or GroupedDataFrame (I assume that it saves them correctly by strong both the view object and the underlying DataFrame?).
The question is how does it handle saving
SubDataFrame, orGroupedDataFrame(I assume that it saves them correctly by strong both the view object and the underlyingDataFrame?).
I tested saving and loading both SubDataFrame and GroupedDataFrame and they seem to work just fine... is this something that we should mention?
maybe here:
.... , JLD2 preserves custom Types including SubDataFrame and GroupedDataFrame.
Sorry for a delay. I think it is OK the way you proposed. Just can you please move JLD2 after CSV (as CSV is for sure more popular).
Also @nalimilan - could you please have a look at wording of the PR?