Add Chaumont Script

**Font Project Git Repo URL:**
https://github.com/AlexandreBassi0/ChaumontScript/tree/main

**Super short description of the Font Family:**
Timothée Gouraud (Fabrication Maison) discovered in 2016 the work of Chantal Jacquet, sign painter in Chaumont (Haute-Marne, France) in the 1980s. Intigued by these singular shapes, he contacted ANRT to design a digital font out of it. A complex task, achieved by Alexandre Bassi, who managed to transcribe the rythm and cursivity of this script, through a extended character set (2500 glyphs) and complex OpenType Features.

**Requirements:**

I understand that Google Fonts will publish only fonts that matches [its requirements](https://googlefonts.github.io/gf-guide/), 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 (@AlexandreBassi0, the designer will)

**Image:**
[chaumont-script-specimen-051021-finalblue-envoi-corrige-web.pdf](https://github.com/google/fonts/files/11951174/chaumont-script-specimen-051021-finalblue-envoi-corrige-web.pdf)