Add section about code quality in RF

[MobyNL]

• Why code quality is important (link style guide)
• Example Code Standard
• Pre Commit Hook using Robot Framework

Ask Bartlomiej to help write a section about Robocop

• Robocop

• Robotidy (check progress on combined Robocop-tidy tool)

• Sherlock?

[MobyNL]

@bhirsz regarding our chat in the slack, I assigned it to you for the robocop part! Feel free to reach out if necessary