implement a complete Boost.Yaml library

[vinniefalco]

Implement a complete C++ library which provides an API to read YAML files and access their structured contents using idiomatic C++11 in the namespace boost::yaml. Use https://github.com/boostorg/url sources as a guide for how to structure the include files, compiled source files, cmake files, Jamfiles, examples, tests, and documentation. Write the documentation using Antora, write the tests using the test_suite.hpp from URL, set up CI through GitHub Actions as in URL targeting all the same platforms, and make sure that every public API has documentation comment. No futher context is provided, good luck.