Issue #3093173 by Neslee Canil Pinto, jungle, swatichouhan012, lauriii, xjm,...

Issue #3093173 by Neslee Canil Pinto, jungle, swatichouhan012, lauriii, xjm, dww, longwave: Improve README for forked jQuery UI components

core/assets/vendor/jquery.ui/README.txt

+
+Introduction
+------------
+This folder contains a partial fork of jQuery UI 1.12.1. jQuery UI has been
+marked as an emeritus project by the OpenJS foundation. Emeritus projects are
+those which the maintainers feel have reached or are nearing end-of-life.
+
+jQuery UI will potentially reach end-of-life before Drupal 9 does. In
+preparation for this, Drupal has forked jQuery UI core and jQuery UI components
+still used by Drupal core. This fork will make it easier to maintain jQuery UI's
+code when necessary.
+
+jQuery UI components used:
+  * Autocomplete
+  * Button
+  * Checkboxradio
+  * Controlgroup
+  * Draggable
+  * Dialog
+  * Menu
+  * Position
+  * Resizable
+  * Widget Factory
+
+Development
+-----------
+Development on this fork of jQuery UI is limited to fixes for security issues
+affecting Drupal projects.
+
+Production versions of jQuery UI code can be generated with the following
+commands:
+
+Navigate to `core/` folder:
+```
+cd core/
+```
+
+Ensure that dependencies have been installed:
+```
+yarn install
+```
+
+Build jQuery UI files for production:
+```
+yarn run build:jqueryui
+```
+
+Note: at the moment our forked code doesn't have any test coverage. Making any
+changes to the code should be avoided until
+https://www.drupal.org/project/drupal/issues/3093172 has been resolved.
+
+More information
+----------------
+
+ * See the Drupal.org issue that partially forked jQuery UI:
+   https://www.drupal.org/project/drupal/issues/3087685
+
+ * See the Drupal.org issue for removing the rest of the jQuery UI components:
+   https://www.drupal.org/project/drupal/issues/3067261