Add build example for windows images (UWP)

**Context**

I didn't find any example of windows UWP build and documentation is a bit complicated -> https://game.ci/docs/docker/windows-docker-images because if I understand everything -> after steps from documentation, I should write own powershell scripts to start build in container. For me it's a bit hard because I'm newbie with CI/CD, I stucked at this moment and I think there will be more people like me :)

**Suggested solution**

Add ps scripts for build and license and some example in gtilab-ci.yml