Add Fermata
Version 6.4.x
Fermata is part of annotation. See Add Annotation.
Version 6.3.x and Earlier
Fermata has it's own addFermata function.
// Add fermata at previously added note or rest.
builder.addFermata("atNote");
builder.addFermata(); // Use "atNote" if omitted.
// Add fermata at current measure end.
builder.addFermata("atMeasureEnd");