This PR mostly adds the boilerplate kind of documentation you would expect.

• License
• Code of Conduct
• Multiple Issue Templates (bug report, feature request, ask for help)
• Pull Request Template
• Code Owners
• Top level contributing guide that links to various different guides
• Various guides for opening issues, PRs, examples etc.
• Tidies up the Readme to point to other docs.

There is one major feature of this PR. It introduces a *commit message guideline*. I ask everyone that reviews this PR to please take a close look at these guidelines added in the Pull Requests guide.

Overall, the commit message guidelines are very simple to follow, and they provide a lot of value.

• Commit messages are more readable, especially when looking through the *project history*.
• Commit messages to describe whether a major, minor or patch change has been introduced (see [semver.org](https://semver.org/)).
• Commit messages can be used to generate a changelog.