multiple-desktops: Add new desktop button xml file

- Add the skeleton xml file for the new desktop button
- Add the icon for this button as well
- Create the kotlin file for this button

Flag: EXEMPT as added files haven't connected with the production logic
Fix: 379941322
Test: None
Change-Id: I5c7ea2c061f0f9539483221f40c892626103d11e
3 files changed