I have no idea if something like that exists.
You can post your sketch plus description in Exhibition / Gallery - Arduino Forum or in e.g. General Discussion - Arduino Forum.
If you can pour it in the form of a tutorial and incorporating comments like encountered issues during development) you can post in any category that covers the idea. You can then wait for comments from others about improvements, incorporate them and later you can ask a moderator to move it to the Introductory Tutorials - Arduino Forum (see How to submit a tutorial).
Note that the IDE sections are not for the purpose described above.
As your question is not IDE related, it has been moved to a more suitable location on the forum.