Added batch file to help compiling OrangeTX

Multiprotocol/Build_orangetx.cmd

@@ -0,0 +1,19 @@
+@echo off
+if "%AVR32_HOME%"=="" (
+echo.
+echo You must install winavr to compile Multi for OrangeTX: https://sourceforge.net/projects/winavr/
+echo.
+pause
+exit /b
+)
+if exist MultiOrange.cpp.orangetx ren *.orangetx *.
+if exist .dep (make clean)
+md .dep
+make
+if exist MultiOrange.hex (
+echo.
+echo Compilation OK.
+echo Use MultiOrange.hex to program your OrangeTX module.
+echo.
+)
+pause