New Adapter: ADBRO (#6277)

* Added ADBRO Bid Adapter description for Developer Portal.

ADBRO-4287

Signed-off-by: Alexander Shvetsov <ashvetsov@adbro.me>

* Added newline at EOL to fix MD047 error.

Signed-off-by: Alexander Shvetsov <ashvetsov@adbro.me>

* Removed duplicated newline to fix MD012 error.

Signed-off-by: Alexander Shvetsov <ashvetsov@adbro.me>

---------

Signed-off-by: Alexander Shvetsov <ashvetsov@adbro.me>

Author: ashvetsov

dev-docs/bidders/adbro.md

@@ -0,0 +1,22 @@
+---
+layout: bidder
+title: ADBRO
+description: ADBRO Bid Adapter
+biddercode: adbro
+pbjs: true
+pbs: false
+gvl_id: 1316
+tcfeu_supported: true
+userIds: all
+media_types: banner
+schain_supported: true
+floors_supported: true
+sidebarType: 1
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name           | Scope    | Description           | Example   | Type      |
+|----------------|----------|-----------------------|-----------|-----------|
+| `placementId`  | required | Placement (Slot) ID   | `'1234'`  | `string`  |