New Haxmedia bidder adapter (#2521)
New Haxmedia bidder adapter (#2521)

* initail

* Update haxmedia.md

Co-authored-by: Aiholkin <d5826e2bae6ae853443cb75f274a83a8a1bb956c@smartyads.com>
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io