Add Iosveka Charon

[jul-sh]

Font Project Git Repo URL:

https://github.com/jul-sh/iosevka-charon

Super short description of the Font Family: Iosevka Charon is a quasi-proportional font excellent for technical writing and dense UI. Iosevka Charon Mono is a true monospace font tuned for coding and terminal use. Both are based on the popular Iosveka; but built in a Google Fonts compliant way. Both support 240+ languages.

Mainline Iosveka currently cannot be added (see #4728); this resolves this, allowing us to add a version of Iosveka to Google fonts.

Requirements:

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

• The entire font project is available in a Github repository (repo) and licensed under the OFL
• The source files are available in the repo
• I am the sole copyright author of the entire project, or, all other copyright authors have licensed their work to me under the OFL
• 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.
• The family name is unique according to namecheck.fontdata.com
• 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.
• The font supports at least the Google Fonts 'Latin Core' glyphset from github.com/googlefonts/glyphsets (direct link)
• The repo has the Google Fonts preferred upstream repo structure
• I have read, agree with, and comply with, the full Google Fonts contributing requirements
• I will maintain the repository and participate in the onboarding process (addressing, solving, and responding to issues, merging pull requests, etc)

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