Update CONTRIBUTING.md (#1360)

CONTRIBUTING.md

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 Welcome, and thank you for considering contributing to defsec!
 
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 The following guide gives an overview of the project and some directions on how to make common types of contribution. If something is missing or you get stuck, please [jump on Slack](https://slack.aquasec.com/) or [start a discussion](https://github.com/aquasecurity/defsec/discussions/new) and we'll do our best to help.
 
 ## Project Overview
 
 _defsec_ is a library for defining security rules and policies in code, and the tools to apply those rules/policies to a variety of sources. The general architecture and project layout are defined in [ARCHITECTURE.md](ARCHITECTURE.md) - this is a great place to start exploring.
 
+_defsec_ is also the misconfiguration/IaC/Cloud scanning engine for Trivy. Trivy uses defsec internally as a library to perform various scans. 
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 ## Guides
 
 The following are guides for contributing to the project in specific ways. If you're not sure where to start, these are a good place to look. If you need some tips on getting started with contributing to open source in general, check out this useful [GitHub contribution guide](https://docs.github.com/en/get-started/quickstart/contributing-to-projects).