what is the file sample.yml undering the sample helloworld used for?

[DMA-Transport]

what is the file sample.yml undering the sample helloworld used for?

[Albrecht Markus Schellenberger]

Hello,

It is used to automate the building and testing of samples using Twister, the Zephyr test tool. Additional information can be found here. 

Regards,

Markus

[DMA-Transport]

so,it is ok to delete the file in my project,right?

[Albrecht Markus Schellenberger]

Yes.