Improve generated documentation in docs.microsoft.com

Part of a continuous effort to improve the documentation, there are elements to be done to improve the all up experience:

- Add a reference to the readme from each binding folder to the source code of each main class
- should look like this in the intellisense comments: `[!INCLUDE[detailed usage](~/includes/Ads115/README.md)]`
- the folder name will have to match the name of the directory
- the file name is always READM.md as so far we only have this one
- in some cases like RTC, there are subfolder, follow the same subfolder strcture
- When creating a release the tool which will transform the READMEs need to be run. Tool located here: https://github.com/dotnet/iot/tree/main/tools/GenerateDocFxStructure
- the tool will create all the directories necessary, the sub directories if needed, move the README
- the tool will move as well all the images in another specific directory with a proper structure
- the tool will adjust all the necessary links from the pictures
- the tool will adjust all relative links to the repo to transform them into absolute links
- **all** the generated files need to be moved with the xml docs generated content for the PR into the iot-api-docs repository
- The [docfx.json](https://github.com/dotnet/iot-api-docs/blob/main/iot-api-docs/docfx.json) file from the iot-api-docs must be adjusted to include the new files as content (include and media), maybe other adjustments needed