Add info to try migrate from Chamilo LMS 1.9.x to 1.10.x - refs #8390

plugin/bbb/README.md

@@ -2,4 +2,17 @@ BigBlueButton Chamilo plugin
 ============================
 This plugin allows you to have videoconference rooms in each course.
 It requires you to have a BigBlueButton videoconference server installed on another server (ideally).
-Check http://www.bigbluebutton.org/ for more about BigBlueButton.
+Check www.bigbluebutton.org for more about BigBlueButton.
+
+## Migrating from Chamilo LMS 1.9.x to 1.10.x
+For Chamilo 1.10.x, the Videoconference plugin has two new settings options: *Enable global conference* and *Enable conference in course groups*.
+
+##### Database changes
+You need execute this SQL query en your database after making the migration process from 1.9.x.
+
+```sql
+ALTER TABLE plugin_bbb_meeting ADD voice_bridge int NOT NULL DEFAULT 1;
+ALTER TABLE plugin_bbb_meeting ADD group_id int unsigned NOT NULL DEFAULT 0;
+ALTER TABLE plugin_bbb_meeting ADD user_id int unsigned NOT NULL DEFAULT 0;
+ALTER TABLE plugin_bbb_meeting ADD access_url int NOT NULL DEFAULT 1;
+```