New AdTrue bidder

[haibau]

Type of change

• [x ] New bidder adapter

Description of change

add new adtrue bidder

• test parameters for validating bids

{
  bidder: 'adtrue',
  params: {
                  zoneId: '21423',
                  publisherId: '1234',
                  reserve: 0.2
                  }
}

PR for update prebid dev-docs: prebid/prebid.github.io#2603

[lgtm-com]

This pull request introduces 7 alerts when merging ead2cb4 into 24538ca - view on LGTM.com

new alerts:

• 7 for Unused variable, import, function or class