Added info about calling a metamethod
Added info about calling a metamethod

Ok, added info about metamethods.
mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03,mamontov-cpp/dukpp-03