ENH: Notebook with both pytorch and tensorflow

[meoflynn]

Description:

New notebook where it installs both pytorch and tensorflow into the image

---

Submitter:

Have you done the following?:

• Added a new directory in the project root with a Dockerfile inside?
• Tested the image works?

---

Reviewer:

Have you done the following?:

• Does the Dockerfile install only the necessary packages?
• Are the permissions of downloaded files onto the container appropriate?
• Does the Dockerfile switch to NB_UID at the end of the file? (i.e the image is run as user, not root)
• Has the image been built successfully and pushed to Harbor?