Instructions how to setup and work locally

<img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" decoding="async" class="lazy" data-src="https://img.shields.io/badge/reflectometry%20Task%20371%20-%20in%20progress%20-%20green">

Action Items

• What docs are already there?
• Should it become a section itself?
• Brainstorms subsections. Ask for help/revision in case I missed something
  • starting things first time (conda environment, assign yourself to the docker group)