README: Added note about Windows support
README: Added note about Windows support

Related to issue #12.

openthread/wpantund,aeliot/wpantund,abtink/wpantund,aeliot/wpantund,d-bahr/wpantund,d-bahr/wpantund,openthread/wpantund,d-bahr/wpantund,aeliot/wpantund,abtink/wpantund,abtink/wpantund,openthread/wpantund,abtink/wpantund,openthread/wpantund,d-bahr/wpantund,aeliot/wpantund