Update the challenge creation guide to use extensions

[escottalexander]

Currently the main branch repo contains instructions on how to add a challenge. It appears it is not giving advice on how to create an extension but instead, the prior challenge type.

https://github.com/scaffold-eth/se-2-challenges?tab=readme-ov-file#-contributing-guide-and-hints-to-create-new-challenges

We are going through these steps currently so we can submit a PR to change this if it seems helpful.

[carletex]

We are going through these steps currently so we can submit a PR to change this if it seems helpful.

That would be amazing!

[escottalexander]

@carletex When you are able can you add a new branch called base-challenge-extension-template. I will a submit a PR to that branch with some files that should kick-start any new challenge extension. It should replace the need for the existing base-challenge-template branch. Feel free to name it whatever you think will work best.

[carletex]

Hey @escottalexander I added you on the repo, you should be able to create branches.

base-challenge-extension-template looks great to me!

[rin-st]

Hey @escottalexander . As an option you can move old base-challenge-template branch to base-challenge-template--v0 as we do for all other challenges, and then recreate base-challenge-template for your needs so it will have clean git history.

Note: for some reason we didn't use template branch for challenges extensions, but we can fix it in future if needed