Added cmdlets for add, get and remove for classification nodes, iterations and areas

[SebastianSchuetze]

PR Summary

Adding the follwoing cmdlet

• Add-VSTeamClassificationNode
• Add-VSTeamIteration
• Add-VSTeamArea
• Get-VSTeamIteration
• Get-VSTeamArea
• Remove-VSTeamArea
• Remove-VSTeamIteration
• Remove-VSTeamClassificationNode

the last for only use the more basic functions using the ClassificationNode. But inproves usability and are basically just a wrapper.

PR Checklist

• [x] Write Help
• [x] Write Unit Test
• [ ] Update CHANGELOG.md

[DarqueWarrior]

I assume this is a work in progress? I only see one file changed.

[SebastianSchuetze]

Yes, it is WIP. Just wanted to make use of the pipelines already. Then we mark PRs as in Progress in the future.

[SebastianSchuetze]

276 is related

[DarqueWarrior]

You want me to help you convert these functions to use the attributes?

[SebastianSchuetze]

@DarqueWarrior yes, please. I guess you talk about the changes you made?

[SebastianSchuetze]

Finally got the unit tests running. Also added Get-VSTeamIteration and Get-VSTeamArea. Now we have Add, Get and Remove cmdlets completed with unit tests.

Also adjusted to the new project attribute. I saw that there is still 3-4 cmdlet who use the old approach. I will handle it in another PR.