Adf prebid-server adapter added (#2887)

* adformOpenRTB prebid-server adapter added

* rename adformOpenRTB adapter to adf

* descriptive title

dev-docs/bidders/adformOpenRTB.md → dev-docs/bidders/adf.md

@@ -1,15 +1,17 @@
 ---
 layout: bidder
 title: AdformOpenRTB
-description: Prebid AdformOpenRTB Bidder Adaptor
-biddercode: adformOpenRTB
+description: Prebid Adf Bidder Adaptor
+biddercode: adf
 media_types: no-display, native
 gdpr_supported: true
 usp_supported: true
 prebid_member: true
 pbjs: true
+pbs: true
 userIds: britepoolId, criteo, id5Id, identityLink, liveIntentId, netId, parrableId, pubCommonId, sharedId, unifiedId
 gvl_id: 50
+prevBiddercode: adformOpenRTB
 ---
 
 ### Bid params
@@ -22,3 +24,5 @@ gvl_id: 50
 | `site`      | optional | Site id              | `'123123'`         | `string`  |
 | `priceType` | optional | Price type           | `'gross'`          | `string`  |
 | `publisher` | optional | Info about publisher | `{"id": "2706", "name": "name", "domain": "dom"}`                | `object`  |
+
+Note: prebid-server adapter supports only `mid` parameter - other params could be set by adjusting prebid-server openRTB request.