LiveIntent Analytics Adapter (prebid#4005)

* Add documentation for liveIntentAnalyticsAdapter (prebid#9)

* add doc for liveIntentAnalyticsAdapter

* Add prebid_member information

Co-authored-by: leonelcuevas <lcuevas@liveintent.com>

* add example configuration

* fix comment

* Fix example json identation

* adjust comment

Co-authored-by: Wiem Zine El Abidine <wiemzin@gmail.com>
Co-authored-by: wiem <welabidine@liveintent.com>

dev-docs/analytics/liveintent.md

@@ -0,0 +1,26 @@
+---
+layout: analytics
+title: LiveIntent
+description: LiveIntent Analytics Adapter
+modulecode: liveintent
+prebid_member: true
+gvl_id: 148
+---
+
+#### Registration
+
+Please visit [LiveIntent](https://www.liveintent.com/) for more information.
+
+#### Example Configuration
+
+```
+pbjs.enableAnalytics(
+  {
+    provider: 'liveintent',
+    options: {
+      bidWonTimeout: 2000,
+      sampling: 0.5 // the tracked event percentage, a number between 0 and 1.
+    }
+  }
+)
+```