In the Atom IDE:
Open file>settings
Click “+” (install)
Search for a terminal package called “platformio-ide-terminal”
Click “install”.
Press Crtl+` to toggle the terminal
For Windows follow the below steps
(1)go to file>setting and click on install
(2) then type “platformio-ide-terminal” in packages and hit install
(3) after finish install restart atom and press
ctrl + ~ for opening the terminal `~` is the key below `Esc`
welcome 😉