Add project limelight docs (#1315)

* Add project limelight docs

* adding alias

Because your actual adapter filename is different than your bidder-code, this alias will be needed for the download page to work

dev-docs/bidders/project-limelight.md

@@ -0,0 +1,16 @@
+---
+layout: bidder
+title: Project Limelight
+description: Prebid Project Limelight Bidder Adaptor
+hide: true
+biddercode: project-limelight
+aliasCode: projectLimeLight
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name           | Scope      | Description                                                    | Example            |type|
+| :-----------   | :--------- | :------------                                                  | :----------------- |:---|
+| `adUnitId` | required   | Ad Unit Id will be generated on Project Limelight Platform. | 0                        |integer|
+| `adUnitType`      | required   | Type of Ad Unit ('video', 'banner')                                             | 'banner'                 |string|