Add cargo install prerequisite instructions for Linux

[GuillaumeBailey]

Fixes: https://github.com/master-of-zen/Av1an/issues/478

[master-of-zen]

I just was trying that on ubuntu 20.04 instance and there is no libzimg-dev package

[GuillaumeBailey]

Also relevant: https://www.reddit.com/r/AV1/comments/rd5loo/guide_how_to_compile_av1an_on_ubuntu_2104/

I did test my eventual build and found that it segfaults due to vapoursynth. My documentation PR is therefore incomplete.

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From: Zen @.> Sent: Wednesday, January 5, 2022 5:32:08 AM To: master-of-zen/Av1an @.> Cc: Guillaume Bailey @.>; Author @.> Subject: Re: [master-of-zen/Av1an] Add cargo install prerequisite instructions for Linux (PR #479)

I just was trying that on ubuntu 20.04 instance and there is no libzimg-dev package

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