chore(docco): Add Homebrew as a MacOS install option

[mapkon]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This PR advertises the fact that falcoctl can easily be installed via the Homebrew package manager

Which issue(s) this PR fixes:

Fixes #494

Special notes for your reviewer:

[poiana]

@mapkon: The label(s) area/documentation cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind documentation

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area documentation

What this PR does / why we need it:

This PR advertises the fact that falcoctl can easily be installed via the Homebrew package manager

Which issue(s) this PR fixes:

Fixes #494

Special notes for your reviewer:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[poiana]

Welcome @mapkon! It looks like this is your first PR to falcosecurity/falcoctl 🎉

[cpanato]

lgtm

can you please rebase?

thanks

[FedeDP]

/approve
Thanks!

[poiana]

LGTM label has been added.

Git tree hash: d86fce0e934733ca2511c86722c7c34288f63edc

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, mapkon

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