SilverMob bidder (#2458)

Co-authored-by: Anton Nikityuk <antony.sq@gmail.com>

dev-docs/bidders/silvermob.md

@@ -0,0 +1,23 @@
+---
+layout: bidder
+title: SilverMob
+description: SilverMob Bidder Adapter
+biddercode: silvermob
+gdpr_supported: true/false
+media_types: banner, video, native
+pbjs: false
+pbs: true
+prebid_member: false
+---
+
+### Note:
+
+The SilverMob Bidding adapter requires setup before beginning. Please contact us at partners@silvermob.com
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description           | Example   | Type      |
+|---------------|----------|-----------------------|-----------|-----------|
+| `zoneid`      | required | Placement id         | `'3011'`    | `string` |
+| `host`      | required | Data center location         | `'us'`    | `string` |