The documents in this checkin contain a proposal for supporting
single file distribution in .Net Core.

To support apps published as a single-file, [CoreCLR#20287](https://github.com/dotnet/coreclr/issues/20287)
proposed extracting out all the embedded dependencies to files at startup.
However, based on customer feedback through public and private fourms, the design
proposed here uses a hybrid of in-memory execution and extraction to files.

Further stages of improvements are outlined in staging.md.

This checkin has two changes:
* Add information about collecting telemetry
* Clarify the information about implementation repos.

Remove the bundler command line interface, since it is not expected to be used by customers.
Add a note about how SDK consumes the bundler tool.