add eventtracker file

android/Omnivore/app/src/main/java/app/omnivore/omnivore/EventTracker.kt

@@ -0,0 +1,33 @@
+package app.omnivore.omnivore
+
+import android.content.Context
+import com.segment.analytics.kotlin.android.Analytics
+import com.segment.analytics.kotlin.core.*
+import org.json.JSONObject
+import javax.inject.Inject
+
+class EventTracker @Inject constructor(val app: Context) {
+  val segmentAnalytics: Analytics
+
+  init {
+    val writeKey = app.getString(R.string.segment_write_key)
+
+    segmentAnalytics = Analytics(writeKey, app.applicationContext) {
+      trackApplicationLifecycleEvents = true
+      application = app.applicationContext
+      useLifecycleObserver = true
+    }
+  }
+
+  fun registerUser(userID: String) {
+    segmentAnalytics.identify(userID)
+  }
+
+  fun debugMessage(message: String) {
+    track(message)
+  }
+
+  fun track(eventName: String, jsonObject: JSONObject = JSONObject()) {
+    segmentAnalytics.track(eventName, jsonObject)
+  }
+}