Add homebrew cask package

[ShGKme]

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Is your feature request related to a problem? Please describe.

Installing Nextcloud Talk on macOS using package manager

Describe the solution you'd like

Add Nextcloud Talk to homebrew - the most popular (yet 3rd party) package manager on macOS.

Describe alternatives you've considered

Alternatives are much less popular on macOS

Additional context

Note: homebrew doesn't versionaze GUI (cask) apps