* Updating README.md files as well as man pages
This aligns with the latest changes in the official documentation. It also aligns dotnet test readme.md to official docs and introduces a new doc in the "Documentation" directory that deals with dotnet test protocols.
* Add and modify commands' README files
Update those READMEs that are outdated. Add READMEs for dotnet pack
and dotnet restore as well.
* Removing private info, adding feedback alias
`dotnet --version` returns just the version number. This helps tools get this information without having to parse the full info.
Introduce a new argument `--info` that returns the current "long form". With this, we also change the long form to say "RID" instead of "Runtime ID" simply because that would avoid any future localization issues and thus make the parsing easier.
Fix#1607#1882
DOTNET_HOME is no longer required, though it is a documented override, so this change removes all unnecessary references to DOTNET_HOME from the CLI Repo.
