Add brainy bidder params (prebid#757)

* Add brainy bidder params

* removed empty row from bottom of table

Author: brainymisio

dev-docs/bidders/brainy.md

@@ -0,0 +1,20 @@
+---
+layout: bidder
+title: brainy
+description: Prebid brainy Bidder Adaptor
+top_nav_section: dev_docs
+nav_section: reference
+hide: true
+biddercode: brainy
+biddercode_longer_than_12: false
+---
+
+### bid params
+
+{: .table .table-bordered .table-striped }
+| Name | Scope | Description | Example |
+|:-----------|:---------|:------------|:-----------------|
+| `accountID` | required | `accountID of the ad unit` | |
+| `slotID` | required | `slotID of the ad unit` | |
+| `width` | required | `width of ad slot` | |
+| `height`| required | `height of ad slot` | |