Additional update of CONTRIBUTING.md

[larsolofsson]

Should papiNet add the rule for merging into the master branch to CONTRIBUTING.md?
For example
"All commits must be made to a non-protected branch and submitted via a pull request before they can be merged into a the master branch. The pull request targeting the master branch requires 3 approvals and no changes requested before it can be merged."

Rule as specified in Github settings
Require a pull request before merging into branch master
When enabled, all commits must be made to a non-protected branch and submitted via a pull request before they can be merged into a branch that matches this rule

Require approvals
When enabled, pull requests targeting a matching branch require a number of approvals and no changes requested before they can be merged.
3 approvals required.

Which maintainers can make an approval?
Is there any difference between voting and approval?
I have only found a specification of which maintainers can vote but nothing about approving.

---

Proposed update of the following text
"When you merge the develop branch or a hotfix/<my-hotfix> branch into the main branch, you MUST ALWAYS check that there are only changes via the new MAJOR++.0.0/, MAJOR.MINOR++.0/, or MAJOR.MINOR.PATCH++/ folders, and that all other MAJOR.MINOR.PATCH/ folder remains unchanged."
To be changed to
"When you merge the develop branch or a hotfix/<my-hotfix> branch into the main branch, you MUST ALWAYS check that there are only changes via the new MAJOR++.0.0/, MAJOR.MINOR++.0/, or MAJOR.MINOR.PATCH++/ folders and changes of supporting files, and that all other existingMAJOR.MINOR.PATCH/ folders remains unchanged."