Adelement Bid Adapter: initial release doc (prebid#5098)

* feat: add doc for adelement md

dev-docs/bidders/adelement.md

@@ -0,0 +1,30 @@
+---
+layout: bidder
+title: AdElement
+description: Prebid AdElement Bidder Adapter
+biddercode: adelement
+tcfeu_supported: true
+gvl_id: 196
+usp_supported: true
+coppa_supported: true
+schain_supported: true
+media_types: banner, native, video, audio
+pbjs: false
+pbs: true
+pbs_app_supported: true
+prebid_member: false
+multiformat_supported: will-bid-on-one
+sidebarType: 1
+---
+
+### Note
+
+Bidding adapter requires setup before beginning.
+Please contact us at <prebid@adelement.com>
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description           | Example   | Type      |
+|---------------|----------|-----------------------|-----------|-----------|
+| `supply_id`      | required | Supply Id | `'1'`    | `string` |