Add Kubeflow application

[Rishit-dagli]

This PR adds the new Kubeflow application which should make it very easy for users to start using Kubeflow on Civo. I tried to approach this by using kubectl wait too however that requires me to separate out the CRDs and namespaces and I thought this approach would just be easier.

If your pull request is to submit a new application to the marketplace, please answer the following questions:

• [x] Have you followed the guidelines in our Contributing document in setting up the application?
• [x] Have you checked that the application your submission is proposing to add does not yet exist on the Marketplace, or as a pull request to be processed?
• [x] Have you tested your application on the Civo managed Kubernetes service? Please include a screenshot.

The Kubernetes Cluster is running:

I am able to access the Kubeflow dashboard:

• [x] Can you confirm that the software you are submitting licensed for use in a publicly-available Kubernetes marketplace?

Yes, please see: https://github.com/kubeflow/kubeflow/blob/master/LICENSE

• [x] Have you included the specific version of the application to be installed?

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Closes #341