Add Graduate VF (Eduardo Tunni)

**Font Project Git Repo URL:**
https://github.com/etunni/Graduate-Variable-Font
See: https://github.com/google/fonts/issues/4134

**Super short description of the Font Family:**
A complex variable font (14 axes): https://etunni.github.io/Graduate-Variable-Font/

**Requirements:**

I understand that Google Fonts will publish only fonts that matches its requirements, and I can confirm the project meets them (by ticking the cases, or putting x between the square brackets in text mode):

- [x] The entire font project is licensed under the [OFL](https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL)
- [x] There is no "Reserved Font Name" mention in the OFL license
- [x] Family name is unique according to namecheck.fontdata.com
- [x] The font supports at least [GF Latin Core glyphset](https://github.com/googlefonts/glyphsets/tree/main/GF_glyphsets/Latin/)
- [x] The repository respect the [upstream repo structure](https://googlefonts.github.io/gf-guide/upstream.html)
- [x] The source files are available in the repository
- [x] I read, agree and comply with the full [contributing requirements](https://googlefonts.github.io/gf-guide/onboarding.html)
- [x] I am the author of the font or the author agreed to this submission
- [x] I will maintain the repository

**Images**