add.IntervalTier: Add an IntervalTier to a TextGrid
In jpellman/textgridR: textgridR

Adds an IntervalTier to a TextGrid.

1 2	add.IntervalTier(textgrid, name, xmin, xmax, intervalmins, intervalmaxs, intervaltexts)

`textgrid`	The TextGrid object to modify.
`name`	The name of the IntervalTier to be inserted.
`xmin`	The earliest time point for the intervals contained in the IntervalTier.
`xmax`	The latest time point for the intervals contained in the IntervalTier.
`intervalmins`	A vector of beginning values for the Intervals in the IntervalTier.
`intervalmaxs`	A vector of end values for the Intervals in the IntervalTier.
`intervaltexts`	A vector of text annotations for the Intervals in the IntervalTier.