[FEA] Add New Unsupervised Learning Example (#371)

Adds a new unsupervised learning example that can learn embeddings.  Closes #364

Authors:
  - Alex Barghi (https://github.com/alexbarghi-nv)

Approvers:
  - Tingyu Wang (https://github.com/tingyu66)

URL: #371

Author: alexbarghi-nv