Update README.md - branch main is now the base branch

[cmsis-freertos] / Demo / AVR_ATMega4809_IAR / RTOSDemo.eww

<?xml version="1.0" encoding="UTF-8"?>
<workspace>
    <project>
        <path>$WS_DIR$\RTOSDemo.ewp</path>
    </project>
    <batchBuild />
</workspace>