Vertex AI - March 1st, 2019 [Feature]

## Feature [AI Platform Notebooks](https://cloud.google.com/ai-platform/notebooks/docs/overview) is now available in beta. AI Platform Notebooks enables you to create and manage virtual machine (VM) instances that are pre-packaged with [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/getting%5Fstarted/overview.html) and a suite of deep learning software. Visit the [AI Platform Notebooks overview](https://cloud.google.com/ai-platform/notebooks/docs/overview) and the [guide to creating a new notebook instance](https://cloud.google.com/ai-platform/notebooks/docs/create-new) to learn more.