Add Chainguard

Signed-off-by: Billy Lynch <[email protected]>

chainguard/README.md

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+# Chainguard
+
+Chainguard builds secure container images that eliminate CVEs from the start.
+
+Their core product is Chainguard Images, which are a collection of container
+images that have been designed to be secure and minimal. These images are built
+from source with a minimal set of dependencies, which helps to reduce the attack
+surface and make them less vulnerable to security vulnerabilities. All
+Chainguard Images come with a software bill of materials (SBOM) and SLSA
+attestations, which make use of the in-toto attestation format.
+
+## References
+
+- <https://chainguard.dev>