ATtint24 Core Library for Arduino

giorgi111-111:
I know that you have ATtiny25 but I want ATtiny24 library

ATtiny24 is a variant of the ATtiny84. Look at the differences between ATtiny85 and ATtiny25 and apply those to the ATtiny84 entry of your choice. Maybe something like this:

attiny24at8.name=ATtiny24 @ 8 MHz
attiny24at8.upload.using=arduino:arduinoisp
attiny25at8.upload.maximum_size=2048

Default clock (slowly rising power; long delay to clock; 8 MHz internal)

Int. RC Osc. 8 MHz; Start-up time PWRDWN/RESET: 6 CK/14 CK + 64 ms; [CKSEL=0010 SUT=10]; default value

Brown-out detection disabled; [BODLEVEL=111]

Preserve EEPROM memory through the Chip Erase cycle; [EESAVE=0]

attiny24at8.bootloader.low_fuses=0xE2
attiny24at8.bootloader.high_fuses=0xD7
attiny24at8.bootloader.extended_fuses=0xFF
attiny24at8.bootloader.path=empty
attiny24at8.bootloader.file=empty24at8.hex

attiny24at8.build.mcu=attiny24
attiny24at8.build.f_cpu=8000000L
attiny24at8.build.core=tiny

Make a copy of one of the empty bootloader files and re-name it empty24at8.hex