Add San Grotesque

**Font Project Git Repo URL:**

https://github.com/BarclaySoftware/SanGrotesque

**Super short description of the Font Family:**

**Requirements:**

The San Grotesque font (whose name is inpsired by the family it is designed to replace and the style of that family) is a variable font designed to be metrically compatible with Apple's font San Francisco. It is based on Pretendard and Inter and covers the 100-900 range of SF Pro Text but does not have any italics.

By opening this issue, I confirm the project meets the following requirements:

- [x] The entire font project is available in a Github repository (repo) and licensed under the [OFL](https://openfontlicense.org/open-font-license-official-text/)
- [x] The source files are available in the repo
- [x] I am the sole copyright author of the entire project, or all other copyright authors have licensed their work to me under the OFL, and I commit to clearly disclosing if AI tools were used in the creation of this project.
- [x] There are no "Reserved Font Names" in the OFL license information, or in the project documentation of any known upstream projects. If there are RFNs, they are not used in whole or in part in this family name, or, I want to discuss how Google can work with my use of them.
- [x] The family name is unique according to [namecheck.fontdata.com](https://namecheck.fontdata.com/)
- [x] The name of the font family expected to appear on app menus must be very clearly communicated and definitive. It should not include any copyright holder's full names or acronyms.
- [x] The font supports at least the Google Fonts 'Latin Core' glyphset from [github.com/googlefonts/glyphsets](https://github.com/googlefonts/glyphsets) ([direct link](https://github.com/googlefonts/glyphsets/blob/main/data/results/txt/nice-names/GF_Latin_Core.txt))
- [x] The repo has the [Google Fonts preferred upstream repo structure](https://googlefonts.github.io/gf-guide/upstream.html)
- [x] I have read, agree with, and comply with, the full [Google Fonts contributing requirements](https://googlefonts.github.io/gf-guide/index#pre-production-getting-your-fonts-ready-for-gf)
- [x] I will maintain the repository and participate in the onboarding process (addressing, solving, and responding to issues, merging pull requests, etc)

**Image:**

Start by reviewing the linked San Grotesque repository and the Google Fonts pre-production and contributing requirements. Check the upstream structure, OFL licensing, family naming, and Latin Core coverage, then follow the Google Fonts onboarding process. Done means the font project is ready for onboarding and the submitter can maintain it and respond to follow-up work.

Written by the indexing model from the issue text.