Create greeting bot using Github Actions for new pull requests and issues

## Background
We'd like to add a greeting bot that provides a comment when a new pull request or issue is made

# Solution
Use Github Actions to create a greeting bot for new issues and new pull requests in the TakeTwo-DataScience repository.

Learn more about Github Actions [here](https://docs.github.com/en/actions/learn-github-actions/understanding-github-actions#create-an-example-workflow):

## Tasks
- Use [this greeting bot an example ](
https://github.com/Call-for-Code-for-Racial-Justice/Five-Fifths-Voter/blob/main/.github/workflows/greetings.yml)
- Read about Github Actions
- Create Github Action, title the yml file`greetings.yml`
- Test Github Action

## Acceptance criteria
- Github action is present in ./github/workflows folder in TakeTwo-DataScience repo.
- file is named `greetings.yml`
- greetings for PR and issue is as listed in [example](
https://github.com/Call-for-Code-for-Racial-Justice/Five-Fifths-Voter/blob/main/.github/workflows/greetings.yml)

Read the linked GitHub Actions documentation and the example .github/workflows/greetings.yml first. Create .github/workflows/greetings.yml for new issues and pull requests, then test the workflow. Done means the file exists in the repository and produces the greetings listed in the example.

Scritto dal modello di indicizzazione a partire dal testo della issue.