Added more participants

[vimode]

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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This PR includes

• More participating companies, projects and events.
• Updated the instructions for How to sign up for the entire list based on your last commit.

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[crweiner]

An amazing job as always, @vimode! Thank you so very much for making the Hacktoberfest Swag List so complete right at the start of Hacktoberfest! You're incredible!