1st version of the doc for raveltech bid adapter

[mnguyen-raveltech]

🏷 Type of documentation

• [x] new bid adapter

📋 Checklist

• [X] Related pull requests in prebid.js or server are linked -> https://github.com/prebid/Prebid.js/pull/11977
• [X] For new adapters check submitting your adapter docs

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[mnguyen-raveltech]

Closing this one because the adapter needs some fixes (the unit tests). The doc will be submitted at the same time as the adapter.

[bretg]

The PBJS code PR has been closed twice. Closing this docs PR.