init doxygen

include/greeter.h

@@ -4,13 +4,28 @@
 
 namespace greeter {
 
+  /**  Language codes to be used with the Greeter class */
   enum class LanguageCode { EN, DE, ES, FR };
 
+  /**
+   * A class for greeting in multiple languages
+   */
   class Greeter {
     std::string name;
 
   public:
+
+    /**
+     * Creates a new greeter
+     * @param name the name to greet 
+     */
     Greeter(std::string name);
+
+    /**
+     * Creates a localized string containing the greeting 
+     * @param lang the language to greet in
+     * @return a string containing the greeting
+     */
     std::string greet(LanguageCode lang = LanguageCode::EN) const;
   };