Clearly mark that this repo is dead and direct people to elsewhere

[bendoerr]

Hey All,

This issue confirmed that src-d is out of business and this repo and tool is no longer maintained here.
#113

If @marnovo could update the description or readme to make that clear it would be great.

Additionally @daniel-sullivan noted that his company charm-jp was willing to take over the project. So maybe directing people over there would be great.

[marnovo]

@bendoerr added the notice on readme at #118.
Happy to point people elsewhere to help the community, otherwise better to just archive it. Let me know.