[TIMOB-18338] Add documentation for already-implemented Windows APIs

In TIDOC-2011, we created the ability to overlay YAML documentation from multiple sources. For this ticket we need to do the following: * Copy a similar documentation structure from https://github.com/appcelerator/titanium_mobile/tree/master/apidoc into https://github.com/appcelerator/titanium_mobile_windows, which likely means the creation of an "apidoc" folder. * For the implemented proxies, create a corresponding shell .yml file that contains the "Windows" platform addition, as well as any additional descriptions or notes as appropriate. * As a follow-on ticket, a way to automatically generate this documentation through a script or tool.