Compass Adapter: add new adapter (#3441)

* add Compass Adapter

* fix

* add endpointId

dev-docs/bidders/compass.md

@@ -0,0 +1,28 @@
+---
+layout: bidder
+title: Compass
+description: Prebid Compass Bidder Adapter
+biddercode: compass
+usp_supported: true
+gdpr_supported: true
+coppa_supported: true
+schain_supported: true
+floors_supported: true
+media_types: banner, video, native
+pbjs: true
+pbs: true
+pbs_app_supported: true
+gvl_id: 883
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description           | Example   | Type      |
+|---------------|----------|-----------------------|-----------|-----------|
+| `placementId`      | optional | Placement Id         | `'0'`    | `'string'` |
+| `endpointId`      | optional | Endpoint Id         | `'0'`    | `'string'` |
+
+### Note
+
+For the prebid server and prebid.js you only need to use one parameter: either placementId or endpointId