Provide bat for easier compilation on Windows

GK6X/GK6X.bat

@@ -0,0 +1,2 @@
+call %WINDIR%\Microsoft.NET\Framework\v4.0.30319\msbuild.exe ../GK6X.sln
+pause

README.md

@@ -15,7 +15,9 @@ See the [releases](https://github.com/pixeltris/GK6X/releases) page for prebuilt
 
 .NET Framework 4+ is required (should be pre-installed on Windows 7 and higher).
 
-Compile from source using Visual Studio (C# tools required).
+To compile from source you have two options:
+- Run `GK6X/GK6X.bat`
+- Compile using Visual Studio (C# tools required)
 
 ### Linux / Mac
 
@@ -72,6 +74,8 @@ Resets the keyboard to the default config. The dedicated reset keyboard key comb
 
 Starts the GUI web server on http://localhost:6464 (requires the GUI build from the [releases](https://github.com/pixeltris/GK6X/releases) page).
 
+*If you're running from source you'll need to copy the `driver` folder from a release build. For updating the GUI files see [updating.txt](/Build/Data/Updating.txt).*
+
 ### `gui_le`
 
 Copies the lighting files created using the `gui` to the `Data/lighting/` folder so that the `map` command can use them.