Document that Submariner is a CNCF sandbox project
Now that Submariner is a CNCF sandbox project, it is required by the
CNCF that we list this status prominently and use this wording.
@@ -31,6 +31,8 @@ provider, as it utilizes off-the-shelf components to establish encrypted tunnels
Note that Submariner is in the **pre-alpha** stage, and should not be used for production purposes. While we welcome usage and
experimentation, it is quite possible that you could run into bugs.
+Submariner is a Cloud Native Computing Foundation sandbox project.
+
## Architecture
See the [Architecture section on Submariner's website](https://submariner.io/getting-started/architecture/).
