JupyterHub Integration into Unity Marketplace: Create Marketplace JSON

[galenatjpl]

Create the Unity Marketplace JSON file, and directory structure under here:
https://github.com/unity-sds/unity-marketplace/tree/main/applications

See also documentation here:
https://unity-sds.gitbook.io/docs/developer-docs/common-services/docs/users-guide/deployment/deployment-concepts-and-infrastructure/unity-marketplace

[pymonger]

Once PR unity-sds/unity-ads-deployment#181 is merged in, need to update the following marketplace JSON files to point to the origin repo for unity-ads-deployment instead of my fork:

• https://github.com/unity-sds/unity-marketplace/blob/main/applications/unity-ads-efs/0.1/metadata.json#L15
• https://github.com/unity-sds/unity-marketplace/blob/main/applications/unity-ads-jupyterhub/0.1/metadata.json#L16

[mcduffie]

Want to test PR changes with manual deployments first before merging.