Add region tags and readme (#1634)

Author: averikitsch

appengine-java8/analytics/README.md

@@ -0,0 +1,24 @@
+# Google Analytics sample for Google App Engine
+
+<a href="https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/java-docs-samples&page=editor&open_in_editor=appengine-java8/analytics/README.md">
+<img alt="Open in Cloud Shell" src ="http://gstatic.com/cloudssh/images/open-btn.png"></a>
+
+Integrating App Engine with Google Analytics.
+
+## Project setup, installation, and configuration
+
+- Register for [Google Analytics](http://www.google.com/analytics/), create
+an application, and get a tracking Id.
+- [Find your tracking Id](https://support.google.com/analytics/answer/1008080?hl=en)
+and set it as an environment variable in [`appengine-web.xml`](src/main/webapp/WEB-INF/appengine-web.xml).
+
+## Running locally
+This example uses the
+[Maven Cloud SDK based plugin](https://cloud.google.com/appengine/docs/java/tools/using-maven).
+To run this sample locally:
+
+    $ mvn appengine:run
+
+## Deploying
+
+    $ mvn appengine:deploy

appengine-java8/analytics/src/main/java/com/example/appengine/analytics/AnalyticsServlet.java

@@ -16,6 +16,7 @@
 
 package com.example.appengine.analytics;
 
+// [START analytics_track]
 import com.google.appengine.api.urlfetch.URLFetchService;
 import com.google.appengine.api.urlfetch.URLFetchServiceFactory;
 import java.io.IOException;
@@ -67,3 +68,4 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp)
     resp.getWriter().println("Event tracked.");
   }
 }
+// [END analytics_track]

appengine-java8/analytics/src/main/webapp/WEB-INF/appengine-web.xml

@@ -20,4 +20,3 @@
     <env-var name="GA_TRACKING_ID" value="YOUR-GA-TRACKING-ID" />
   </env-variables>
 </appengine-web-app>
-