[Documentation] create a new "Interested Parties" file

[lixuna]

Describe the update: create a new "Interested-Parties.md" file in https://github.com/lfn-cnti/certification repo - like https://github.com/lfn-cnti/bestpractices/blob/main/interested-parties.md

Describe why update is needed

• Expand our community with both consumers and contributors to the CNTI
• Increase participation and voices of CSP members who are critical as end users of CNTI assets

Tasks

• [x] create "Interested-Parties.md" file
• [x] request that participants add their name via a pull request to the .md file
• [ ] tbd