Add to longlist of features

TODO.md

@@ -14,3 +14,39 @@ Data:
 * Filter columns
 * Filter dates before/after/betweeen a given period.
 * Sort by ascending/descending
+
+# Feature list
+
+These probably repeat some of the stuff above, but trying to brain dump at this stage.
+I've tried to categorse according to [MoSCoW method](https://en.wikipedia.org/wiki/MoSCoW_method).
+Happy for these to be moved about.
+
+Must have
+
+- Filter rows by value in single column
+- Filter rows by pattern of single column
+- Sort rows by value in single column (ascending / descending)
+- Download current view of CSV as file
+- Remove / hide column
+
+Should have
+
+- Reorder columns
+- Remove / hide row
+- Data type selection for columns (probably limit to: string = default, number, datetime)
+- Filter rows by column numerical range (iff column contains numerical data)
+- Filter rows by column date range (iff colummns)
+- Add new column (e.g. for additional custom filtering, notes)
+
+Could have
+
+- Add new row
+- Reorder rows /!\ WARNING possible thorny interaction with sort
+- Sort rows by multiple columns
+- Data type inference for columns, based on content of columns
+- Save current CSV customisation so can be re-applied later. /!\ WARNING Very likely to be complet, given the wide possibility of changes. Maybe just sort / filter settings? /!\
+
+Won't have
+
+- Formula
+- Full macro language