Add pulsar in open source editors

Add Pulsar, a hackable and community-led text-editor to
the list of open source editors.

Author: mbvgua

collections/text-editors/index.md

@@ -38,6 +38,7 @@ items:
  - lapce/lapce
  - zed-industries/zed
  - KDE/kate
+ - pulsar-edit/pulsar
 
 display_name: Text editors
 created_by: leereilly