Added notification filter descriptions

app/src/main/java/eu/faircode/email/Log.java

@@ -2721,6 +2721,11 @@ public class Log {
                                 Notification.VISIBILITY_PRIVATE,
                                 Notification.VISIBILITY_PUBLIC,
                                 Notification.VISIBILITY_SECRET));
+                size += write(os, String.format("Interruption filter\r\n"));
+                size += write(os, String.format("- All: no notifications are suppressed.\r\n"));
+                size += write(os, String.format("- Priority: all notifications are suppressed except those that match the priority criteria. Some audio streams are muted.\r\n"));
+                size += write(os, String.format("- None: all notifications are suppressed and all audio streams (except those used for phone calls) and vibrations are muted.\r\n"));
+                size += write(os, String.format("- Alarm: all notifications except those of category alarm are suppressed. Some audio streams are muted.\r\n"));
             }
 
             db.attachment().setDownloaded(attachment.id, size);