Add Qt wrapper gist (#853)
Add Qt wrapper gist (#853)

Add Qt wrapper gist to README as a third party contribution 
jbeder/yaml-cpp,jbeder/yaml-cpp,WrinklyNinja/yaml-cpp,WrinklyNinja/yaml-cpp,dand-oss/yaml-cpp,jbeder/yaml-cpp,dand-oss/yaml-cpp,graehl/yaml-cpp,dand-oss/yaml-cpp,WrinklyNinja/yaml-cpp,graehl/yaml-cpp,WrinklyNinja/yaml-cpp,loot/yaml-cpp,jbeder/yaml-cpp,loot/yaml-cpp,graehl/yaml-cpp,dand-oss/yaml-cpp,loot/yaml-cpp,dand-oss/yaml-cpp,graehl/yaml-cpp,jbeder/yaml-cpp,loot/yaml-cpp,graehl/yaml-cpp