Compile javascript and update README

README.md

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 [![MIT license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/clarkwinkelmann/flarum-ext-mass-actions/blob/master/LICENSE.md) [![Latest Stable Version](https://img.shields.io/packagist/v/clarkwinkelmann/flarum-ext-mass-actions.svg)](https://packagist.org/packages/clarkwinkelmann/flarum-ext-mass-actions) [![Total Downloads](https://img.shields.io/packagist/dt/clarkwinkelmann/flarum-ext-mass-actions.svg)](https://packagist.org/packages/clarkwinkelmann/flarum-ext-mass-actions) [![Donate](https://img.shields.io/badge/paypal-donate-yellow.svg)](https://www.paypal.me/clarkwinkelmann)
 
+This extension adds the ability to perform grouped actions on discussions through checkboxes.
+A future version might re-use the logic for users.
+
+On the discussion list, use the checkbox control in the top left or hover a discussion to select.
+Once discussions are selected, the controls on the top right will change to show available mass actions.
+
+The list of buttons appearing depends on the permissions the actor has.
+
+Change "View mass selection controls" permission in the admin panel to configure who can see the checkboxes.
+This control is only visual, and doesn't impact REST API permissions or rate limiting.
+
+Currently supported features:
+
+- Mark as read
+- Delete/restore (soft delete only)
+- Lock/unlock
+- Set tags (exact list)
+- Add tag (to existing list)
+
+Technical details: current implementation uses existing REST API endpoints and loops through discussions client-side.
+All API requests are dispatched at the same time, so this means there could be rate limiting issues.
+
+This version has not been optimized for mobile.
+It's probably a good idea to only make it visible to moderators for now.
+
+> The intent is to integrate this UI/feature into Flarum in a future release. Please leave feedback on your experience, so we can see what needs tweaking!
+
 ## Installation
 
     composer require clarkwinkelmann/flarum-ext-mass-actions