Add syntax highlighting to the readme (#478)

README.md

@@ -21,11 +21,13 @@ compilers instead of DMD. To install, simply place the generated binary (in the
 # Usage
 The following examples assume that we are analyzing a simple file called helloworld.d
 
+```d
 import std.stdio;
 void main(string[] args)
 {
 	writeln("Hello World");
 }
+```
 
 ### Token Count
 The "--tokenCount" or "-t" option prints the number of tokens in the given file
@@ -214,7 +216,11 @@ If a `dscanner.ini` file is locate in the working directory or any of it's paren
 The "--ast" or "--xml" options will dump the complete abstract syntax tree of
 the given source file to standard output in XML format.
 
+```sh
 $ dscanner --ast helloworld.d
+```
+	
+```xml
 <module>
 <declaration>
 <importDeclaration>
@@ -291,6 +297,7 @@ the given source file to standard output in XML format.
 </functionDeclaration>
 </declaration>
 </module>
+```
 
 For more readable output, pipe the command through [xmllint](http://xmlsoft.org/xmllint.html)
 using its formatting switch.