This change includes a minimal implementation of the std::expected<T, E>proposal in P0323R3 (http://wg21.link/P0323R3) which is hosted in the`cppnetlib` repository.In the process we also document some of our guidelines on the structureof the repository, on naming files, directory structure, and dependencyrequirements.Still TODO:* Fill out the test suite.* Update documentation on using vcpkg on dependencies.* Work our way up to a minimal interface for a connecton type, using our  std::expected utility type.This is related to the work in netlib/cpp-netlib#5 for implementing a minimalconnection type suitable as a building block for higher level protocolimplementations.