added maven instructions

UserGuide.md

@@ -5,6 +5,7 @@
 3. [Gson Performance and Scalability](#TOC-Gson-Performance-and-Scalability)
 4. [Gson Users](#TOC-Gson-Users)
 5. [Using Gson](#TOC-Using-Gson)
+  * [Using Gson with Maven](#TOC-Gson-With-Maven)
   * [Primitives Examples](#TOC-Primitives-Examples)
   * [Object Examples](#TOC-Object-Examples)
   * [Finer Points with Objects](#TOC-Finer-Points-with-Objects)
@@ -41,7 +42,7 @@ Gson can work with arbitrary Java objects including pre-existing objects that yo
 
 ## <a name="TOC-Goals-for-Gson"></a>Goals for Gson
 
-*   Provide easy to use mechanisms like <span style="font-family:courier new,monospace">toString()</span> and constructor (factory method) to convert Java to JSON and vice-versa
+*   Provide easy to use mechanisms like `toString()` and constructor (factory method) to convert Java to JSON and vice-versa
 *   Allow pre-existing unmodifiable objects to be converted to and from JSON
 *   Allow custom representations for objects
 *   Support arbitrarily complex object
@@ -73,6 +74,21 @@ The primary class to use is [Gson](http://code.google.com/p/google-gson/source/b
 
 The Gson instance does not maintain any state while invoking Json operations. So, you are free to reuse the same object for multiple Json serialization and deserialization operations.
 
+## <a name="TOC-Gson-With-Maven"></a>Using Gson with Maven
+To use Gson with Maven2/3, you can use the Gson version available in Maven Central by adding the following dependency:
+```
+<dependencies>
+    <!--  Gson: Java to Json conversion -->
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.5</version>
+      <scope>compile</scope>
+    </dependency>
+</dependencies>
+```
+That is it, now your maven project is Gson enabled. 
+
 ### <a name="TOC-Primitives-Examples"></a>Primitives Examples
 ```
 (Serialization)