Conan package created

[ntagliani]

Hi, I created a conan (https://conan.io/) package for your library and went through the process of inclusion in conan-center. I you are not familiar with conan it's a very nice way of providing c++ dependencies in your project. My package is now included in the main conan repository allowing your library to be downloaded from there. I wrote to you about this a month ago but probably writing into a closed issue has not been very wise from my side (https://github.com/leethomason/tinyxml2/issues/631). Feel free to mention that in the documentation of your library or to link my repo in here (https://github.com/nicolastagliani/conan-tinyxml2). If you want to collaborate on that or have more information just write me. Cheers