For your application to be able to reach the
lib/luwra.hpp header file, you must add
/path/to/luwra/lib to the list of include paths. With Clang and GCC that is done using the
-I/path/to/luwra/lib command-line parameter.
Now you can simply
#include <luwra.hpp> in your C++ files and start using Luwra.
This library does not provide a standalone version of Lua nor does it isolate its features. This means that all functions and classes can operate on lua_State (or the alias State). Doing this allows you to integrate Luwra however you like.
Nevertheless, you must have a version of Lua installed. Luwra will include the necessary header files, but it can't link against the Lua library itself.
A reference manual exists here.