Update vertamedia.md (#567)

Update for Vertamedia Adapter description
Add examples

dev-docs/bidders/vertamedia.md

@@ -10,11 +10,70 @@ biddercode_longer_than_12: false
 prebid_1_0_supported : true
 ---
 
-### bid params
+### Bid params
 
 {: .table .table-bordered .table-striped }
 
 
-| Name | Scope    | Description        | Example  |
-| :--- | :----    | :----------        | :------  |
-| `aid`| required |                    |          |
+| Name | Scope    | Description                   | Example  |
+| :--- | :----    | :----------                   | :------  |
+| `aid`| required | The source ID from Vertamedia.| 324758   | 
+
+
+### Description
+Get access to multiple demand partners across VertaMedia AdExchange and maximize your yield with VertaMedia header bidding adapter.
+
+VertaMedia header bidding adapter connects with VertaMedia demand sources in order to fetch bids.
+This adapter provides a solution for accessing Video demand and display demand
+
+### Test Parameters
+```
+    var adUnits = [
+
+      // Video instream adUnit
+      {
+        code: 'div-test-div',
+        sizes: [[640, 480]],
+        mediaTypes: {
+          video: {
+            context: 'instream'
+          }
+        },
+        bids: [{
+          bidder: 'vertamedia',
+          params: {
+            aid: 332842
+          }
+        }]
+      },
+
+      // Video outstream adUnit
+      {
+        code: 'outstream-test-div',
+        sizes: [[640, 480]],
+        mediaTypes: {
+          video: {
+            context: 'outstream'
+          }
+        },
+        bids: [{
+          bidder: 'vertamedia',
+          params: {
+            aid: 332842
+          }
+        }]
+      },
+
+      // Banner adUnit
+      {
+        code: 'div-test-div',
+        sizes: [[300, 250]],
+        bids: [{
+          bidder: 'vertamedia',
+          params: {
+            aid: 324758
+          }
+        }]
+      }
+    ];
+```