Create version header and update readme (#44)

* add note on github pages

* add version information to standalone. closes #35.

* update version info

* move includes into project directory and create version header

* fix style

* add comment for version header location

include/greeter/greeter.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <string>
+
+namespace greeter {
+
+  /**  Language codes to be used with the Greeter class */
+  enum class LanguageCode { EN, DE, ES, FR };
+
+  /**
+   * A class for saying hello 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;
+  };
+
+}  // namespace greeter