added post title

Author: lvitti

sample/src/main/res/values/strings.xml

@@ -4,5 +4,6 @@
     <string name="app_name">Android Async Http Sample</string>
     <string name="title_get_sample">GET Sample</string>
     <string name="title_json_sample">JSON Sample</string>
+    <string name="title_post_sample">POST Sample</string>    
 
 </resources>