How to add custom icon in liferay clay?

Question

I want to add WhatsApp icon in Liferay and use clay ui then how to add whatsapp icon in clay with liferay.

<clay:link
   buttonStyle="outline-secondary"
   elementClasses="btn-monospaced btn-outline-borderless btn-sm lfr-portal-tooltip"
   href="#link"
   icon="phone"
   title="title"
/>

Answer 1

This problem was solved, see this issue in GitHub.

https://github.com/liferay/clay/issues/3690