Create polymorph.md (#856)

dev-docs/bidders/polymorph.md

@@ -0,0 +1,24 @@
+---
+layout: bidder
+title: Polymorph
+description: Polymorph Prebid Adaptor
+top_nav_section: dev_docs
+nav_section: reference
+hide: true
+biddercode: polymorph
+biddercode_longer_than_12: false
+prebid_1_0_supported : true
+media_types: native, video, banner
+---
+
+### Note:
+Polymorph adapter requires setup and approval from the Polymorph team. Please reach out to your account team or support@getpolymorph.com for more information.
+
+### bid params
+
+{: .table .table-bordered .table-striped }
+| Name | Scope | Description | Example |
+| :--- | :---- | :---------- | :------ |
+| `placementId` | required | The placement id/key provided by Polymorph | `'ENvsYZ6m5DPDk6r7ogYV63DO2sBQoJ5EpckcXSlw'` |                                       |
+| `defaultWidth` | optional | In case multiple ad sizes are supported, it's recommended to specify default height and width for native ad (in case native ad is chose as a winner). In case of banner or outstream ad any one of the above sizes can be chosen depending on the highest bid. | `300` |                                       |
+| `defaultHeight` | optional |  | `250` |                                       |