Sparteo Bid Adapter: Add Sparteo documentation

[geoffray-viously]

🏷 Type of documentation

• new bid adapter

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• For new adapters check submitting your adapter docs

PR in Prebid.js : prebid/Prebid.js#10582

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[bretg]

please put quotes around the string params. backticks are just highlight markdown.

[geoffray-viously]

please put quotes around the string params. backticks are just highlight markdown.

Hello @bretg,

I've made the changes.

Geoffray