Fixes path reference and code formatting in readme.

Changes Example.cpp's directory "src" => "samples" to match repo.
Change code example from indented quote to highlighted code block.

readme.md

@@ -79,7 +79,7 @@ directory, and for more in-depth look at the language, the unit tests in the
 "unittests" directory cover the most ground.
 
 For examples of how to register parts of your C++ application, see 
-"example.cpp" in the "src" directory. Example.cpp is verbose and shows every 
+"example.cpp" in the "samples" directory. Example.cpp is verbose and shows every 
 possible way of working with the library. For further documentation generate 
 the doxygen documentation in the build folder or see the website 
 http://www.chaiscript.com.
@@ -87,21 +87,21 @@ http://www.chaiscript.com.
 
 The shortest complete example possible follows:
 
-    /// main.cpp
+```C++
+/// main.cpp
 
-    #include <chaiscript/chaiscript.hpp>
+#include <chaiscript/chaiscript.hpp>
 
-    double function(int i, double j)
-    {
-      return i * j;
-    }
-
-    int main()
-    {
-      chaiscript::ChaiScript chai;
-      chai.add(chaiscript::fun(&function), "function");
-
-      double d = chai.eval<double>("function(3, 4.75);");
-    }
+double function(int i, double j)
+{
+  return i * j;
+}
 
+int main()
+{
+  chaiscript::ChaiScript chai;
+  chai.add(chaiscript::fun(&function), "function");
 
+  double d = chai.eval<double>("function(3, 4.75);");
+}
+```