Added placeholder for windows section of build guide

BUILD_GUIDE.md

@@ -1,9 +1,9 @@
 # Build Guide
 
-## Platform-specific setup
+## Build Environment Setup
 
 ### Windows
-
+What these instructions look like depends on whether NoahAndrews's setup scripts get merged
 
 ### Mac
 

VAGRANT_GUIDE.md

@@ -23,3 +23,4 @@ See [doc/keymap.md](tmk_core/doc/keymap.md).
 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.
 
 If you want to program via the command line you can uncomment the ['modifyvm'] lines in the Vagrantfile to enable the USB passthrough into Linux and then program using the command line tools like dfu-util/dfu-programmer or you can install the Teensy CLI version.
+