Update DAN Marketplace doc to support GDPR (prebid#791)

* Add doc for DAN_Marketplace Adapter

* Fix format of DAN Marketplace doc file

* Fix DAN Marketplace doc

* Rename doc file for DAN Marketplace Bid Adapter into danmarket.md

* Update doc file to note that DAN Marketplace Bid Adapter support GDPR

Author: danmarketplace

dev-docs/bidders/danmarket.md

@@ -8,6 +8,7 @@ hide: true
 biddercode: danmarket
 biddercode_longer_than_12: false
 prebid_1_0_supported : true
+gdpr_supported: true
 ---