icons: Update README and include list of in-house icons.

web/shared/icons/README.md

@@ -1,8 +1,56 @@
-This directory contains icons used by the Zulip web app that are not
-part of Font Awesome 4.7, our default/primary icon font.
+This directory contains icons used by the Zulip web app, primarily
+sourced from Lucide Icons and Feather Icons (see `docs/THIRDPARTY).
 
 Icons placed in this directory are compiled by the web application
 build system into a custom icon font. You can use them in HTML using
 the following syntax:
 
 `<i class="zulip-icon zulip-icon-more-vertical">`
+
+It is critical that icons from third parties be listed with appropriate
+attribution in the `docs/THIRDPARTY` file. To make it easier to audit
+that file in the future, below is a list of custom icons created in-house
+for the Zulip project:
+
+arrow-down.svg
+bold.svg
+bot.svg
+browse-channels.svg
+compose-scroll-left.svg
+compose-scroll-right.svg
+dm-groups-3.svg
+exclamation-circle.svg
+gif.svg
+hashtag.svg
+heading-triangle-right.svg
+help-bigger.svg
+help.svg
+keyboard.svg
+line-height-big.svg
+link.svg
+manage-search.svg
+masked-unread.svg
+math.svg
+ordered-list.svg
+panel-left-dashed.svg
+panel-left.svg
+pin.svg
+placeholder.svg
+question.svg
+quote-message.svg
+quote.svg
+search-inbox.svg
+send.svg
+sort-arrow-down.svg
+spoiler.svg
+strikethrough.svg
+topic-list.svg
+topic.svg
+type-big.svg
+unordered-list.svg
+unpin.svg
+unread.svg
+user-circle-active.svg
+user-circle-deactivated.svg
+user-circle-idle.svg
+user-circle-offline.svg