PoweShell is not installed by default on Windows Core edition. We need to enable this feature. One of the prerequisite for PowerShell is .Net Framework so we have to install .Net framework first. To install .Net Framework 4.0 run the following Command
Dism /Online /Enable-Feature /FeatureName:NetFx4 /All OR Dism /Online /Enable-Feature /FeatureName:NetFx4 /All /LimitAccess /Source:X:\sources\sxs
To install PowerShell run below command:
Dism /Online /Enable-Feature /FeatureName:MicrosoftWindowsPowerShell /All