Create QUICK_START.md describing Vagrantfile usage

Provides links to software required to use the Vagrantfile.

QUICK_START.md

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+# Quick Start Directions
+
+This project includes a Vagrantfile that will allow you to build a new firmware for your keyboard very easily without major changes to your primary operating system. This also ensures that when you clone the project and perform a build, you have the exact same environment as anyone else using the Vagrantfile to build. This makes it much easier for people to help you troubleshoot any issues you encounter.
+
+## Requirements
+
+Using the Vagrantfile in this repository requires you have [Vagrant](http://www.vagrantup.com/) as well as [VirtualBox](https://www.virtualbox.org/) (or [VMware Workstation](https://www.vmware.com/products/workstation) and [Vagrant VMware plugin](http://www.vagrantup.com/vmware) but the (paid) VMware plugin requires a licensed copy of VMware Workstation/Fusion).
+
+Other than having Vagrant and Virtualbox installed and possibly a restart of your computer afterwards, you can simple run a 'vagrant up' anywhere inside the folder where you checked out this project and it will start a Linux virtual machine that contains all the tools required to build this project. There is a post Vagrant startup hint that will get you off on the right foot, otherwise you can also reference the build documentation below.
+
+Build Firmware and Program Controller
+-------------------------------------
+See [doc/build.md](tmk_core/doc/build.md), or the README in the particular keyboard/* folder.
+
+Change your keymap
+------------------
+See [doc/keymap.md](tmk_core/doc/keymap.md).
+
+## Flashing the firmware
+
+The "easy" way to flash the firmware is using a tool from your host OS like the Teensy programming app. [ErgoDox EZ](keyboard/ergodox_ez/README.md) gives a great example.