Update CONTRIBUTING.md

[OliEfr]

Pull Request

Please fill out the following template when you create a PR. This will help to process your PR faster!

Description

I proprose the following changes in my PR:

• Change 1
• ...

Here you can also add screenshots, if applicable.

References

I created the PR because ...

Referenced Issue:

Referenced ToDo from project-board:

Type of change

• Bug fix (non-breaking change which fixes a bug)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that might cause existing functionality to not work as expected)

Further info

• This change requires a documentation update
• I updated the documentation accordingly, if required
• I commented my code where its useful

Testing

We have 1500+ Users. Please test your changes thoroughly.

• Tested my changes on Firefox
• Tested my changes on Chromium-Based-Browsers
• Successfully run npm run test locally

Additional Information

Add anything here, that might be important.