you can create an ini file from notepad or grab one from online like from deepsea,
here is an example for fss0/hekate build
[config]
autoboot=0
autoboot_list=0
bootwait=3
verification=1
backlight=100
autohosoff=0
autonogc=1
updater2p=1
{DeepSea}
{Github:
https://github.com/orgs/Team-Neptune/}
{--- Custom Firmware ---}
[CFW (SYSNAND)]
emummc_force_disable=1
fss0=atmosphere/package3
atmosphere=1
logopath=bootloader/bootlogo.bmp
icon=bootloader/res/icon_payload.bmp
{}
[CFW (EMUMMC)]
emummcforce=1
fss0=atmosphere/package3
atmosphere=1
logopath=bootloader/bootlogo.bmp
icon=bootloader/res/icon_payload.bmp
{}
{--- Stock ---}
[Stock (SYSNAND)]
emummc_force_disable=1
fss0=atmosphere/package3
stock=1
icon=bootloader/res/icon_switch.bmp
{}
and here is example for vanilla Atmosphere
[config]
autoboot=1
autoboot_list=0
bootwait=3
verification=1
backlight=100
autohosoff=0
autonogc=1
{------- Launch -------}
[Atmosphere]
payload=bootloader/payloads/fusee.bin
icon=bootloader/res/icon_atmosphere.bmp
[Horizon]
fss0=atmosphere/package3
stock=1
icon=bootloader/res/icon_horizon.bmp