Setup requirements

Adding the env.yml file to create conda environments. This was created by hand based on the requirements.txt file, but worked when tested.

This conda approach is, in my opinion, a simpler and more user-friendly approach, which will make the package more usable for non-expert users before we provide a packaged version.

Also, I updated the readme with the corresponding instructions.

Please let me know what you think, and if you have suggestions on how to make this conda/pip/poetry more intuitive and flexible.

This pull request addresses issue #49 (closed)