Add Persian(Farsi) translation

[ali4zimi]

I added a new file named index-fa.html for Persian Translation. Also, since Persian is a right-to-left language I also used dir attribute of html tag and set it to rtl.

[MattiSG]

Thank you very much @ali4zimi for this addition! We just need to get another native speaker to review this content to get it merged 😃 I'll ask around, but please feel free to mention some other Persian speakers you might know!

[anovenus]

I have read it and I think it's well translated

[MattiSG]

Thank you for your feedback @anovenus! Unfortunately, your public GitHub profile does not provide any information enabling to confirm your status as a native Farsi speaker. Do you have any other reference to provide to confirm it? 🙂 Thank you for your understanding!

[ali4zimi]

I have read it and I think it's well translated

Thanks though, if you know someone else please mention them here