Add OperaAds Bid Adapter docs (#2) (prebid#3092)

* Add OperaAds Bid Adapter docs (#2)

* fixup! Add OperaAds Bid Adapter docs (#2)

* fixup! fixup! Add OperaAds Bid Adapter docs (#2)

dev-docs/bidders/operaads.md

@@ -0,0 +1,31 @@
+---
+layout: bidder
+title: OperaAds
+description: Prebid OperaAds Bidder Adapter
+biddercode: operaads
+gdpr_supported: false
+gvl_id: none
+usp_supported: false
+coppa_supported: true
+schain_supported: true
+dchain_supported: false
+media_types: banner, video, native
+safeframes_ok: false
+bidder_supports_deals: false
+pbjs: true
+pbs: true
+prebid_member: false
+---
+
+### Registration
+
+If you have any questions regarding set up, please reach out to your account manager or adtech-prebid-group@opera.com.
+
+### Bid Parameters
+
+{: .table .table-bordered .table-striped }
+| Name        | Scope    | Description            | Example          | Type     |
+|-------------|----------|------------------------|------------------|----------|
+| `placementId`| required | Placement Id          | `s12345678`      | `string` |
+| `endpointId`| required | Endpoint ID            | `ep1234566`      | `string` |
+| `publisherId`| required | Publisher ID          | `pub123456`      | `string` |