added logo of illa Cloud in list.md

[aditya7302]

Thanks for contributing to the Hacktoberfest Swag List 😃 🎉! Before submitting your pull request, please check off as many of the items below as you can:

1. I have read the Contributing.md file and formatted this PR correctly
2. I'm not adding a company from the blocklist
3. I make sure to fix things promptly if an error or suggestion comes up

Thanks and Happy Hacktoberfest! 🎉
Tagging @crweiner to take a look. 👀

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[crweiner]

Howdy @aditya7302! Appwrite's logo is on the site in a few places as they are an official sponsor of this project, the website, and the repo. Appwrite is also a sponsor of Hacktoberfest at-large, but that reason alone is not why their logo is throughout the project.

Thank you for your PR and I hope you can contribute to add a new organization to the Swag List!