Scaffolding for the project

[soupi]

We should create some scaffolding for the project. These should include:

• A readme, including project description, build steps and links to the process/contribution guide/etc.
• A contribution guide
• A list of contributors
• A license
• Book structure and relevant files, assuming we are going to use mdbook:
  • book.toml
  • .md file per chapter
  • .gitignore
• Github CI script to automatically generate and publish the book from sources on push

I've done some of the work here.