Revert "add 3file in lab2"

This reverts commit f8a0ce86e5dc646ae5879ada9484e2390b82c1dd.
update aboutme.xml -> utain.xml
Revert "Revert "add 3file in lab2""

This reverts commit afadd76c816fb7a64ee3d5935f7f1f25e9985c73.