Viously Bid Adapter : New Adapter (prebid#4058)

* Add: viously.md for Viously Bid Adapter

* Update viously bidder documentation

* Add: video parameters

* Update the header

dev-docs/bidders/viously.md

@@ -0,0 +1,66 @@
+---
+layout: bidder
+title: Viously
+description: Prebid Viously Bidder Adaptor
+pbjs: true
+pbs: false
+biddercode: viously
+media_types: video
+gdpr_supported: true
+gvl_id: none
+usp_supported: true
+prebid_member: false
+floors_supported: false
+fpd_supported: false
+schain_supported: false
+safeframes_ok: true
+deals_supported: false
+floors_supported: false
+fpd_supported: false
+ortb_blocking_supported: false
+multiformat_supported: will-bid-on-one
+---
+
+### Note:
+Viously Header Bidding adapter requires setup and approval. Please reach out to prebid@viously.com for more details.
+
+### Bid params
+
+{: .table .table-bordered .table-striped }
+| Name        | Scope    | Description                                                                                 | Example    | Type      |
+|-------------|----------|---------------------------------------------------------------------------------------------|------------|-----------|
+| `pid`       | required | Your publisher ID. This information will be given to you by the Viously team.               | `1234`     | `integer` |
+
+### Video Object
+
+{: .table .table-bordered .table-striped }
+| Name             | Scope    | Description                                                              | Example      | Type             |
+|------------------|----------|--------------------------------------------------------------------------|--------------|------------------|
+| `context`        | required | The video context, either 'instream', 'outstream'.                       | `instream`   | `String`         |
+| `playerSize`     | required | The size (width, height) of the video player on the page, in pixels.     | `[640, 480]` | `Array<integer>` |
+| `playbackmethod` | required | Defines how the video inventory is initiated following the OpenRTB spec. | `[4, 5]`     | `Array<integer>` |
+
+### Example
+
+```
+var adUnits = [
+    {
+        code: 'test-viously',
+        mediaTypes: {
+            video: {
+                playerSize: [640, 360],
+                context: 'instream',
+                playbackmethod: [1, 2, 3, 4, 5, 6]
+            }
+        },
+        bids: [
+            {
+                bidder: 'viously',
+                params: {
+                    pid: '20d30b78-43ec-11ed-b878-0242ac120002'
+                }
+            }
+        ]
+    }
+]
+```