Add archlinux installation guide

[debendraoli]

I have added this tool on archlinux aur, feel free to add this on installation guide.

https://aur.archlinux.org/packages/iam-policy-json-to-terraform/

[flosell]

Thanks for adding this! I'm not an ArchLinux user myself so not sure I'd give the best instructions in the installation guide.
Could you give me a few pointers? Great if it's in a PR against the readme but feel free to just reply with a few things here as well.

Also, do we need to do anything to keep this package up to date? Any pointers on this?

[debendraoli]

Thanks for the reply, I was too busy on my chores.

I have automated tool that watch and updates the package I manage. It rarly requires manual intervenation.