Add MeloZen bidder adapter documentation (#5467)

* Add MeloZen bidder adapter documentation

* Update media_types

dev-docs/bidders/melozen.md

@@ -0,0 +1,31 @@
+---
+layout: bidder
+title: MeloZen
+description: Prebid MeloZen Bidder Adaptor
+biddercode: melozen
+schain_supported: true
+dchain_supported: false
+media_types: banner, video, native
+deals_supported: false
+floors_supported: true
+fpd_supported: false
+pbjs: false
+pbs: true
+pbs_app_supported: true
+prebid_member: false
+multiformat_supported: will-bid-on-one
+ortb_blocking_supported: false
+sidebarType: 1
+---
+
+### Note
+
+The MeloZen Bidding adapter requires setup before beginning. Please contact us at <[email protected]>
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+
+| Name    | Scope    | Description                       | Example      | Type     |
+|---------|----------|-----------------------------------|--------------|----------|
+| `pubId` | required | The publisher's ID provided by MeloZen | `'386276e072'` | `string` |