ResponsiveAds adapter doc file (#5757)

* ResponsiveAds adapter doc file

* added more information for responsiveads bidder

dev-docs/bidders/responsiveads.md

@@ -0,0 +1,33 @@
+---
+layout: bidder
+title: ResponsiveAds
+description: ResponsiveAds Prebid Adapter
+biddercode: responsiveads
+media_types: banner
+pbjs: true
+pbs: false
+enable_download: true
+gvl_id: 1189
+sidebarType: 1
+safeframes_ok: false
+multiformat_supported: will-bid-on-one
+deals_supported: false
+floors_supported: false
+fpd_supported: false
+ortb_blocking_supported: false
+privacy_sandbox: no
+prebid_member: false
+schain_supported: false
+dchain_supported: false
+---
+
+### Note
+
+If you're using Google Ad Manager (GAM), ensure that the "Serve in Safeframe" option in the creative settings is disabled.
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name        | Scope    | Description                    | Example | Type      |
+|-------------|----------|--------------------------------|---------|-----------|
+| `placementId` | optional | Placement Id   | 'f93kf9knds8n3' | string    |