UPDATE: Add "Export Area to markdown"

[nhatcher]

Hi @dg-ac , I am hesitant to merge this.

On the one hand it is cool, on the other I am not not sure how useful it is. Maybe we can have a common:

Export to:

• PNG
• Markup/down
• ...

NB: You can't test this feature in the widget/storybook but will work on the app.

[dg-ac]

@nhatcher I'll take a look this weekend.

[BrianHung]

I wouldn't do a sheet to markdown method. I would do a getSheetValues or getSheetContent that takes rowStart,rowEnd,colStart,colEnd and returns a 2D array of string values.

Then the developer can decide whether to convert that into a CSV, TSV, HTML table, or a Markdown table.