Mention OSV API in the README (#1328)

Author: Shnatsel

README.md

@@ -10,6 +10,8 @@ of the advisory database can be found at https://rustsec.org/advisories/.
 
 We also export advisory data to the [OSV](https://github.com/ossf/osv-schema) format,
 see the [`osv`](https://github.com/rustsec/advisory-db/tree/osv) branch.
+All our data is available on [osv.dev](https://osv.dev/list?ecosystem=crates.io&q=)
+and through their [API](https://osv.dev/#use-the-api).
 
 The following tools consume this advisory database and can be used for auditing
 and reporting (send PRs to add yours):