Open the terminal in visual studio?

You can have a integrated terminal inside Visual Studio using one of these extensions:

Whack Whack Terminal

Terminal: cmd or powershell

Shortcut: Ctrl\, Ctrl\

Supports: Visual Studio 2017

https://marketplace.visualstudio.com/items?itemName=DanielGriffen.WhackWhackTerminal

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BuiltinCmd

Terminal: cmd or powershell

Shortcut: CtrlShiftT

Supports: Visual Studio 2013, 2015, 2017, 2019

https://marketplace.visualstudio.com/items?itemName=lkytal.BuiltinCmd

Visual Studio 2019 update:

Now vs has built-in terminal

View > Terminal (Ctrl+")

To change default terminal

Tools > Options - Terminal > Set As Default

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Before Visual Studio 2019

From comments best answer is from @Hans Passant

1. Add an external tool.

Tools > External Tools > Add

Title: Terminal (or name it yourself)

Command=cmd.exe Or Command=powershell.exe

Arguments= /k

Initial Directory=$(ProjectDir)

2. Tools > Terminal (or whatever you put in title)

3. Enjoy!

As tricky solution you can use Package Manager Console to execute cmd or PowerShell commends

Shortcut for Package Manager Console Alt T N O

Tested on Visual Studio 2017 Community Version

Also its available now as part of Visual Studio version 16.3 Preview 3

Shortcut Ctrl+` same as Visual Studio Code