Add HarmonyOS Sans font.

[sgalcheung]

Verification

• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

Provide a detailed description of the proposed feature

https://developer.huawei.com/consumer/en/doc/design-guides-V1/font-0000001157868583-V1

What is the motivation for the feature?

add font

How will the feature be relevant to at least 90% of Homebrew users?

add font

What alternatives to the feature have been considered?

add font

[sgalcheung]

By the way, how do we consider adding font?

Can I create a PR to homebrew/cask?

reference: How-To-Open-a-Homebrew-Pull-Request

[EricFromCanada]

Can I create a PR to homebrew/cask?

Yes; see both Adding Software to Homebrew and How to Open a Homebrew Pull Request for info. Also see the list of font casks for examples.