Added a link to Osh park to the readme

[dgmets]

PR checklist

• Tag the issue(s) or milestones this PR fixes (e.g. Fixes #123, Resolves #456).
• Describe the changes you've made.
• Describe any tests you have conducted to confirm that your changes behave as expected.
• If you've added new software dependencies, make sure that those dependencies are included in the appropriate conda environments.
• If you've added new functionality, make sure that the documentation is updated accordingly.
• If you encountered bugs or features that you won't address, but should be addressed eventually, create new issues for them.