Eaglesoft's Hanger

Its a radio frequency,but
Is there a read me file anywhere ❓

It's all in the pdf manual which should have been included in the download.

Have a look at this -
https://forum.flyawaysimulation.com/forum/topic/3058/where-gps-kid-hangs-out/

Just in case you haven't found it - here it is -

Dial 112.00 on the Nav2 radio and click the 'transfer button' to make that the active frequency. It may take a few seconds for the door to begin to open but afterwards it will respond in 2 seconds.