add mediaconsortium adapter documentation (#5546)

Co-authored-by: Maxime Lequain <[email protected]>

dev-docs/bidders/mediaConsortium.md

@@ -0,0 +1,74 @@
+---
+layout: bidder
+title: Media Consortium
+description: Prebid Media Consortium Bidder Adapter
+biddercode: mediaConsortium
+media_types: banner, video
+pbjs: true
+userId: all
+multiformat_supported: will-bid-on-any
+sidebarType: 1
+---
+
+MediaConsortium doesn't require inventory parameters - we'll match your inventory using a combination of ad unit code and domain.
+
+### Prebid JS configuration
+
+To get access to the full feature set of the adapter you'll need to allow localstorage usage in the `bidderSettings`.
+
+```javascript
+    pbjs.bidderSettings = {
+        mediaConsortium: {
+            storageAllowed: true
+        }
+    }
+```
+
+MediaConsortium uses the [1plusX](https://www.1plusx.com/) user id (fpid) and profile API to retrieve audience and site specific segments. You can manage 1plusX usage with the settings outlined below.
+
+#### Managing 1plusX profile API usage and fpid retrieval
+
+You can use the `setBidderConfig` function to enable or disable 1plusX profile API usage and fpid retrieval.
+
+If the keys found below are not defined, their values will default to `false`.
+
+```javascript
+    pbjs.setBidderConfig({
+        bidders: ['mediaConsortium'],
+        config: {
+            // Controls the 1plusX profile API usage
+            useProfileApi: true,
+            // Controls the 1plusX fpid retrieval
+            readOnePlusXId: true
+        }
+    });
+```
+
+#### Required pbjs ad unit video parameters
+
+| Name       | Scope    | Description                               | Example        | Type                 |
+|------------|----------|-------------------------------------------|----------------|----------------------|
+| playerSize | required | Array of sizes accepted by the player     | `[[300, 250]]` | `[number, number][]` |
+| context    | required | Video context, must always be `outstream` | `outstream`    | `string`             |
+
+##### Example ad unit
+
+```javascript
+    const adUnits = [
+        {
+            code: 'div-prebid-video',
+            mediaTypes:{
+                video: {
+                    playerSize: [[300, 250]],
+                    context: 'outstream'
+                }
+            },
+            bids:[
+                {
+                    bidder: 'mediaConsortium',
+                    params: {}
+                }
+            ]
+        }
+    ];
+```