Update README.md

[javoha]

Changed geometry images to 3D views

Added two references (Ariel, 2022 and von Harten, 2021)

Description

Small changes to the ReadMe for improved style and reference update.

Checklist

• [x] My code follows the PEP 8 style guidelines.
• [x] My code uses type hinting for function and method arguments and return values.
• [x] My code contains descriptive and helpful docstrings which are formatted per the Google Python Style Guidelines.
• [x] I have created tests which entirely cover my code.
• [x] The test code either 1. demonstrates at least one valuable use case (e.g. integration tests) or 2. verifies that outputs are as expected for given inputs (e.g. unit tests).
• [x] New and existing tests pass locally with my changes.