add md file for tapadIdSystem

modules/tapadIdSystem.md

@@ -0,0 +1,43 @@
+### Tapad ID
+
+Tapad's ID module provides access to a universal identifier that publishers, ad tech platforms and advertisers can use for data collection and collation without reliance on third-party cookies.
+Tapad's ID module is free to use and promotes collaboration across the industry by facilitating interoperability between DSPs, SSPs and publishers.
+
+To register as an authorized user of the Tapad ID module, or for more information, documentation and access to Tapad’s Terms and Conditions please contact  [prebid@tapad.com](mailto:prebid@tapad.com).
+
+Tapad’s Privacy landing page containing links to region-specific Privacy Notices may be found here: [https://tapad.com/privacy.html](https://tapad.com/privacy.html).
+
+Add it to your Prebid.js package with:
+
+
+`gulp build --modules=userId,tapadIdSystem`
+
+#### Tapad ID Configuration
+
+| Param under userSync.userIds[] | Scope | Type | Description | Example |
+| --- | --- | --- | --- | --- |
+| name | Required | String | `"tapadId"` | `"tapadId"` |
+| params | Required | Object | Details for Tapad initialization. | |
+| params.company_id | Required | Number | Tapad Company Id provided by Tapad | 1234567890 |
+
+#### Tapad ID Example
+
+```js
+pbjs.setConfig({
+    userSync: {
+        userIds: [
+            {
+                name: "tapadId",
+                params: {
+                    companyId: 1234567890
+                },
+                storage: {
+                    type: "cookie",
+                    name: "tapad_id",
+                    expires: 1
+                }
+            }
+        ]
+    }
+});
+```