feat: add accessibility title and description to pie chart

* Reuse the title as the title element
* Add description to the parser and then render

src/diagrams/pie/pieRenderer.js

@@ -5,6 +5,7 @@ import pieParser from './parser/pie';
 import { log } from '../../logger';
 import { configureSvgSize } from '../../utils';
 import * as configApi from '../../config';
+import addSVGAccessibilityFields from '../../accessibility';
 
 let conf = configApi.getConfig();
 
@@ -43,6 +44,7 @@ export const draw = (txt, id) => {
     const diagram = select('#' + id);
     configureSvgSize(diagram, height, width, conf.pie.useMaxWidth);
 
+    addSVGAccessibilityFields(parser.yy, diagram, id);
     // Set viewBox
     elem.setAttribute('viewBox', '0 0 ' + width + ' ' + height);