[Minor] Adding an exploratory tutorial on voting in LLaMA

[frankaging]

Description

This is a new exploratory tutorial on voting mechanism in LLaMA with Boundless DAS. See tutorial for details.

Testing Done

Tutorial only.

Checklist:

• [x] My PR title strictly follows the format: [Your Priority] Your Title
• [x] I have attached the testing log above
• [x] I provide enough comments to my code
• [x] I have changed documentations
• [x] I have added tests for my changes