Add adapter: Matterfull

[Matterfull]

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

📋 Checklist

• Related pull requests in prebid.js or server are linked -> New Adapter: Matterfull prebid-server#4343
• For new adapters check submitting your adapter docs

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[muuki88]

Hi @Matterfull

I updated the PR - the check with bidder values are a fallback if none is provided.
You are the bidder and should try to provide proper information here.