Updating kproj file to match tooling changes
Updated project.json based on recent renames
Added UrlContent to baseadress
Renamed configurations to frameworks in project.json
Adding Kestrel package to BugTracker

Also fixed a URL issue. EncodeUriComponent renders the URI incorrect as it escapes / to %2F.
WebListener unescapes the / somehow making even an invalid URL to work. But Kestrel does not escape %2F resulting in 404.
Adding some instructions in readme as well.