add digitalcaramel adapter (prebid#6193)

Author: Hamper

dev-docs/bidders/digitalcaramel.md

@@ -0,0 +1,27 @@
+---
+layout: bidder
+title: Digitalcaramel
+description: digitalcaramel bid adapter
+pbjs: true
+biddercode: digitalcaramel
+media_types: banner, video
+safeframes_ok: true
+tcfeu_supported: false
+gvl_id: none
+usp_supported: false
+coppa_supported: false
+deals_supported: false
+floors_supported: false
+fpd_supported: false
+ortb_blocking_supported: false
+multiformat_supported: will-bid-on-one
+sidebarType: 1
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description   | Example                  | Type     |
+|---------------|----------|---------------|--------------------------|----------|
+| `siteId`      | required | Site id       | `'d1d83nbdi0fs73874a0g'` | `string` |
+| `placementId` | required | Placement id  | `'d1d8493di0fs73874a10'` | `string` |