Add contributor guide and update readme

[amandamartin-dev]

Fixes Issue #35

Changes proposed

Added a basic contribution guide and moved up "how to trigger data" section in readme to make it more discorverable

Check List (Check all the applicable boxes)

• [ ] My code follows the code style of this project.
• [x] My change requires changes to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] All new and existing tests passed.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

Screenshots

Note to reviewers