Outline learning ressources for expected skills, tools, etc.

[asogaard]

Suggested steps:

• [ ] Create a dedicated document (e.g., markdown or wiki) related to learning resources.
• [ ] Identify the technologies/tools used in GraphNeT.
  • [ ] For each such technology/tool, find the best online resources for learning and document these. This could be tutorials, links to documentation, etc.
• [ ] Identify the skills expected for developers working on GraphNeT (e.g., coding standards, quality, documentation)
  • [ ] For each such skill, find the best online resources for learning and document these.

[RasmusOrsoe]

(README, CONTRIBUTING, etc.)? CI pipelines? pre-commit hooks?

[RasmusOrsoe]

black, flake8, mypy