Basic intro to ERUPT notebook

[ZmeiGorynych]

Problem

Add a notebook with a basic example on how to use ERUPT

Proposed changes

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.

Types of changes

What types of changes does your code introduce to causaltune? Put an x in the boxes that apply

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ x] Documentation Update (if none of the other choices apply)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] Description above provides context of the change
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Unit tests for changes (not needed for documentation changes)
• [x] Bumping version in setup.py is an individual PR and not mixed with feature or bugfix PRs
• [x] Commits follow "How to write a good git commit message"
• [x] Relevant documentation is updated including usage instructions