Add guide on how to contribute to the Catalog

[vishalvivekm]

Current Behavior

https://layer5.io/blog/kanvas/what-is-the-kanvas-catalog

How can you contribute to the Catalog?

Desired Situation

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Contributor Resources and Handbook

The layer5.io website uses Gatsby, React, and GitHub Pages. Site content is found under the master branch.

• 📚 See contributing instructions.
• 🎨 Wireframes and designs for Layer5 site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Discussion Forum and Community Slack.

Join the Layer5 Community by submitting your community member form.

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