Add IBCS complient legend.
add_title(svg_string, line1, line2_measure, line2_rest, line3 = "")
one element character vector containing SVG graphic statements. Legend will be added to this plot.
first line of title. Element(s) of the structure dimension represent the object of the report, typically a legal entity, an organization unit, or a line of business
First part of second line of the title. It wil be in bold text. It should represent buisness measure being analyzed.
Second part of second line of the title. It should represent units of measure.
Third line of the title, it should indicate time, scenarios, variances, etc
object of class tidychart with a character vector containing SVG elements