powershell - Script to run a batch of NuGet Package Installer commands -

i'm beginner @ powershell , scripting in general may basic question. how can write script execute batch of nuget commands? want script in file (what extension?) can committed source control.

for example:

install-package unity -version 4.0.1 -project myprojecta install-package unity -version 4.0.1 -project myprojectb