Bidmachine adapter docs (#2819)

* Adds Bidmachine adapter docs

* Fixes quotes

* Adds type column, adds styling

dev-docs/bidders/bidmachine.md

@@ -0,0 +1,31 @@
+---
+layout: bidder
+title: Bidmachine
+description: Prebid Bidmachine Bidder Adapter
+biddercode: bidmachine
+gdpr_supported: true
+gvl_id: 736
+usp_supported: true
+coppa_supported: true
+schain_supported: true
+dchain_supported: false
+media_types: banner, video
+safeframes_ok: true
+bidder_supports_deals: false
+pbjs: false
+pbs: true
+pbs_app_supported: true
+prebid_member: false
+---
+
+### Prebid Server Note:
+The Bidmachine Bidding adapter requires setup before beginning. Please contact us at hi@bidmachine.io .
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description                                     | Example                                | Type     |
+| :------------ | :------- | :---------------------------------------------- | :------------------------------------- |----------|
+| `host`        | required | DC region                                       | `"api-eu"`                             | `string` |
+| `path`        | required | URL path, will be provided by manager           | `"auction/rtb/v2"`                     | `string` |
+| `seller_id`   | required | Your ID in Bidmachine system                    | `"1"`                                  | `string` |