added a .gitignore file to exclude some visual studio build files/dirs
added a .gitignore file to exclude some visual studio build files/dirs

egyp7/ReflectiveDLLInjection,liorvh/ReflectiveDLLInjection,allynstott/ReflectiveDLLInjection,madtrapper/ReflectiveDLLInjection,capturePointer/ReflectiveDLLInjection,0x0mar/ReflectiveDLLInjection,itsbriany/ReflectiveDLLInjection,aaaddress1/ReflectiveDLLInjection,stephenfewer/ReflectiveDLLInjection,itsbriany/ReflectiveDLLInjection,neoz/ReflectiveDLLInjection