Add conanfile.py

[ghost]

I added package for conan.io.

I also plan to contribute it to conan-center. This is the guide. Do you want to maintain the package?

[coveralls]

Coverage remained the same at 94.747% when pulling 19cbd4e on pavel-belikov:support-conan into 34292e2 on Taywee:master.

[Taywee]

I'm fine with somebody else maintaining it if they have the will and ability to, depending on what maintenance of a Conan package entails. If it would be far more convenient to have me maintain, I can do so.