I want to add that it is very strange to introduce Core and Nano servers without native console full-featured editor. Like others I`ll recommend to use vim or nano. But my suggestion is to install it via OneGet (require WMF5)! They both are presented in Chocolatey repository so installation is simple and fast:
PS C:> Find-Package -Name vim | Format-Table -AutoSize
Name Version Status ProviderName Source Summary
---- ------- ------ ------------ ------ -------
vim 7.4.638 Available Chocolatey chocolatey Vim is an advanced text editor...
PS C:> Install-Package vim
