docs: document crates-io-logs

service-catalog/crates-io/README.md

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+# Crates.io
+
+Crates.io is the Rust community's package registry.
+The crates.io
+[team](https://www.rust-lang.org/governance/teams/dev-tools#team-crates-io)
+develops [crates-io](https://github.com/rust-lang/crates.io)
+and the Infra team helps with the infrastructure.
+
+The crates.io app is deployed in Heroku, you can learn more about it in the
+crates-io [docs](https://github.com/rust-lang/crates.io/blob/main/docs/ARCHITECTURE.md).
+
+Here are the details of the crates.io infrastructure managed by the infra team:
+
+- [crates-io-logs](https://github.com/rust-lang/simpleinfra/tree/master/terragrunt/modules/crates-io-logs):
+  the infrastructure that counts crates downloads.
+  It is deployed in the AWS accounts `crates-io-prod` and `crates-io-staging`.
+
+## Versions
+
+These are the versions we need to keep up-to-date:
+
+- Terraform providers in `simpleinfra` repo.