docs: add Chainloop Trace documentation references

Signed-off-by: Miguel Martinez Trivino <miguel@chainloop.dev>

Author: migmartri

.chainloop.yml

@@ -1,3 +1,5 @@
+# organization and projectName are used for Chainloop Trace
+# https://docs.chainloop.dev/reference/operator/trace
 organization: chainloop
 projectName: chainloop
 # This indicates the [current version]+next

CONTRIBUTING.md

@@ -25,6 +25,10 @@ use GitHub pull requests for this purpose. Consult
 [GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
 information on using pull requests.
 
+## Chainloop Trace
+
+This repository has [Chainloop Trace](https://docs.chainloop.dev/reference/operator/trace) enabled. This means that AI coding sessions can optionally be tracked as part of the software supply chain. See [`.chainloop.yml`](./.chainloop.yml) for the configuration.
+
 ## Development
 
 To learn more about how to run the project locally refer to our development [guide](./devel/README.md).