Describe EDM4U analytics in readme

Bug: 157264720

Change-Id: I9713c634ff497f366ecabb2ff1d93232a6c23c5f

Author: chkuang-g

README.md

@@ -124,6 +124,18 @@ their customers.  For more information about integrating EDM4U
 into your own plugin, see the [Plugin Redistribution](#plugin-redistribution)
 section of this document.
 
+# Analytics
+
+The External Dependency Manager for Unity plugin by default logs usage to Google
+Analytics. The purpose of the logging is to quantitatively measure the usage of
+functionality, to gather reports on integration failures and to inform future
+improvements to the developer experience of the External Dependency Manager
+plugin. Note that the analytics collected are limited to the scope of the EDM4U
+plugin’s usage.
+
+For details of what is logged, please refer to the usage of
+`EditorMeasurement.Report()` in the source code.
+
 # Requirements
 
 The *Android Resolver* and *iOS Resolver* components of the plugin only work

source/VersionHandlerImpl/src/VersionHandlerImpl.cs

@@ -2274,7 +2274,8 @@ public static Logger Logger {
     // Privacy policy for analytics data usage.
     internal const string PRIVACY_POLICY = "https://policies.google.com/privacy";
     // Product Url
-    internal const string DATA_USAGE_URL = "https://github.com/googlesamples/unity-jar-resolver/";
+    internal const string DATA_USAGE_URL =
+            "https://github.com/googlesamples/unity-jar-resolver#analytics";
 
     // Analytics reporter.
     internal static EditorMeasurement analytics = new EditorMeasurement(