Add documentation for xfce-test docker environment
Submitted by Kevin Bowen @kevinbowen
Assigned to Kevin Bowen @kevinbowen
Description
Add information under development tools https://docs.xfce.org/contribute/dev/start regarding use of xfce-test docker environment used for testing Xfce builds https://github.com/schuellerf/xfce-test
Could use some beginner info on getting it downloaded, installed, and started with docker