Add link to FutureCoder, which runs on Pyodide

[floer32]

Added a link to https://github.com/alexmojaki/futurecoder . The description text is adapted from this page: https://github.com/pyodide/pyodide/edit/stable/docs/project/related-projects.md

I put it right below the existing link to Pyodide.

• [x] I've read CONTRIBUTING.md.
• [x] Description explains the issue / use-case resolved, and auto-closes the related issue(s) (https://help.github.com/articles/closing-issues-via-commit-messages/).

[Yee1023]

邮件我已收到，谢谢！！