I am using Visual studio for mac. I need to install some packages but I can't find package manager console for that.
Visual studio version: Preview 1 (7.0 build 347)
Similar to Xamarin Studio, you have to use its dialog,
https://developer.xamarin.com/guides/cross-platform/xamarin-studio/nuget_walkthrough/
As there was no cross platform PowerShell, Xamarin Studio lacks of Package Manager Console. It might come one day in Visual Studio for Mac. We will see.