MacOS version

[gambhirsharma]

Hey, I tried the project and the ifetch.sh did not work on my Mac. So I modified and made a Mac version of it. https://github.com/gambhirsharma/ifetch-Mac

I don't know if you want to add this script for Mac to this repo or not. If you want then I can raise a PR. Or else you can link my forked repo to your repos's Readme so that other can use it.

Thanks :)

[FelipeIzolan]

Hi! for me it's okay open a PR, I will check and add a way to check the OS and run specific code for each OS!