3648 prebidjs pxyz adapter

[LucaConfa]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

Add new prebid adapter for playgroundxyz

• test parameters for validating bids

{
      'bidder': 'playgroundxyz',
      'params': {
        'placementId': '10433394'
      },
      'adUnitCode': 'adunit-code',
      'sizes': [[300, 250], [300, 600]],
      'bidId': '30b31c1838de1e',
      'bidderRequestId': '22edbae2733bf6',
      'auctionId': '1d1a030790a475',
    };

Be sure to test the integration with your adserver using the Hello World sample page.

• contact email of the adapter’s maintainer
• official adapter submission

For any changes that affect user-facing APIs or example code documented on http://prebid.org, please provide:

• A link to a PR on the docs repo at https://github.com/prebid/prebid.github.io/

Other information