Attiny88 programming with Arduino
Finally I found ATTinyCore library. I have tested it with a blink sketch. Just download the zip file. Unzip and copy  Attinycore-master directory into "program files/Arduino/hardware/arduino/avr" directory. Restart the IDEA. Select ATTiny x8 Series from the boards menu, and select the specific chip (48 or 88), clock speed, and BOD level from the appropriate menus that will appear in the tools menu after selecting ATTiny x8 series as the board.

https://github.com/SpenceKonde/ATTinyCore