Update readme to add syntax highlighting

README.markdown

@@ -5,26 +5,30 @@ This is an annotation based parameter parsing framework for Java.
 
 Here is a quick example:
 
-    public class JCommanderTest {
-      @Parameter
-      public List<String> parameters = Lists.newArrayList();
-
-      @Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity")
-      public Integer verbose = 1;
-
-      @Parameter(names = "-groups", description = "Comma-separated list of group names to be run")
-      public String groups;
-
-      @Parameter(names = "-debug", description = "Debug mode")
-      public boolean debug = false;
-    }
+```java
+public class JCommanderTest {
+    @Parameter
+    public List<String> parameters = Lists.newArrayList();
+
+    @Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity")
+    public Integer verbose = 1;
+
+    @Parameter(names = "-groups", description = "Comma-separated list of group names to be run")
+    public String groups;
+
+    @Parameter(names = "-debug", description = "Debug mode")
+    public boolean debug = false;
+}
+```
 
 and how you use it:
 
-    JCommanderTest jct = new JCommanderTest();
-    String[] argv = { "-log", "2", "-groups", "unit", "a", "b", "c" };
-    new JCommander(jct, argv);
+```java
+CommanderTest jct = new JCommanderTest();
+String[] argv = { "-log", "2", "-groups", "unit", "a", "b", "c" };
+new JCommander(jct, argv);
 
-    Assert.assertEquals(jct.verbose.intValue(), 2);
+Assert.assertEquals(jct.verbose.intValue(), 2);
+```
 
 The full doc is available at http://beust.com/jcommander