feat(design-resources): added a11y kit (#2601)

src/pages/designing/design-resources/index.mdx

@@ -21,6 +21,7 @@ templates, color palettes, GitHub repos, and design tools.
   <AnchorLink>Gatsby theme</AnchorLink>
   <AnchorLink>GitHub repos</AnchorLink>
   <AnchorLink>Native mobile</AnchorLink>
+  <AnchorLink>Accessibility</AnchorLink>
   <AnchorLink>Prototyping tools</AnchorLink>
 
 </AnchorLinks>
@@ -261,6 +262,23 @@ the patterns and examples, and get started with either the Light or Dark theme.
 </Column>
 </Row>
 
+## Accessibility
+
+The IBM Accessibility Sketch kit includes checklists, bite-sized guidance, and
+handoff assets to make sure your designs are accessible for implementation.
+
+<Row className="resource-card-group">
+
+<Column colLg={4} colMd={4} noGutterSm>
+  <ResourceCard
+    subTitle="IBM Accessibility Sketch kit"
+    href="https://www.sketch.com/s/f0a04c0d-fb62-4d71-92c6-07c402f8cae7"
+    actionIcon="launch">
+    <MdxIcon name="sketch" />
+  </ResourceCard>
+</Column>
+</Row>
+
 ## Prototyping tools
 
 ### Invision Freehand kit