Add user dansarno to .all-contributorsrc

[dansarno]

Changes:
Added user dansarno to .all-contributorsrc

[welcome]

🎉 Thanks for opening this pull request! Please check out our contributing guidelines if you haven't already. And be sure to add yourself to the list of contributors on the readme page!

[limzykenneth]

Hi @dansarno, we usually use a bot to automate adding new contributors instead of manually editing the contributor file. Can you provide a link or short description of the related contributions here for reference purposes? Thanks.

[dansarno]

Thanks @limzykenneth, I see I should have used the allcontributors bot, my mistake. I have created example p5 visualisations featured as community contributions on the Coding Train site. Not sure if this is sufficient to be considered a contributor of examples to this project? If not, I am happy to cancel this pull request

[lmccart]

@dansarno definitely! thanks for submitting this PR