Doc for greebids adapter (#5733)

* Doc for greebids adapter

* review

dev-docs/bidders/greenbids.md

@@ -0,0 +1,35 @@
+---
+layout: bidder
+title: Greenbids
+description: Prebid Greenbids Bidder Adapter
+biddercode: greenbids
+tcfeu_supported: false
+dsa_supported: true
+gvl_id: none
+usp_supported: true
+coppa_supported: false
+gpp_sids: tcfca, usnat, usstate_all, usp
+schain_supported: true
+dchain_supported: true
+media_types: banner, video
+deals_supported: false
+floors_supported: true
+fpd_supported: true
+pbjs: true
+pbs: true
+prebid_member: false
+multiformat_supported: will-not-bid
+ortb_blocking_supported: false
+sidebarType: 1
+---
+
+### Note
+
+The Greenbids Bidding adapter requires setup before beginning. Please contact us at [[email protected]](mailto:[email protected]).
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description           | Example   | Type      |
+|---------------|----------|-----------------------|-----------|-----------|
+| `placementId` | required | Placement id          | `'11111'` | `string`  |