Adding Infracost to the FAQ

[hassankhosseini]

I was talking to a user today who referred to the best practices website, and said Infracost should be listed in the 'tools to be aware of' (https://www.terraform-best-practices.com/faq#what-are-the-tools-i-should-be-aware-of-and-consider-using). I thought that would be cool to add :)

Happy to send a PR if that's easier too <3

[antonbabenko]

Yes, that's a good idea. Consider opening multiple PRs to other branches (for different languages after the first one to master is merged). master branch = English = source for other languages.

[alikhajeh1]

Thanks @antonbabenko, done.