Feature: Describe the chart type

[DiogoRDuarte]

Is your feature request related to a problem? Please describe. Some screen reader users might be interested in having a description of what the chart looks like. This might help them better create a mental model of the visualization.

Describe your proposed solution Given the chart type passed in type, AutoVizuA11y defines what explanation (from a set of predefined explanations) to give to the user. This explanation should be optionally provided, heard after pressing a new shortcut. We believe this new explanation should also be customizable by the Developer, but having some options already available eases the implementation process.

Describe alternatives you've considered Only this solution was considered.

Additional context This idea came from suggestions given during the usability test conducted with screen reader users.
The proposed solution was inspired from the following paper: https://dl.acm.org/doi/abs/10.1145/3544548.3581139