Be a bit more explicit about repo creation

[msdemlei]

You write:

  Now create a repository on https://github.com/ivoa-std/. This requires
  that you are in the ivoa-std organization. 

It took me a while to realise that means "in the github web interface,
under the "+" menu". I guess it would be a nice touch to mention this.

Also, since I think not many people have write permission in ivoa-std,
perhaps that ought to be parameterised, and people should be encouraged
to first clone into their private spaces, as in:

export DESTUSER=msdemlei
...
git remote add origin [email protected]:$DESTUSER/ADQL

[pdowler]

The repository creation is currently restricted so the actual process is that TCG creates the repo and assigns admin permission to the appropriate WG. As a result, the migration process is slightly different (but in my opinion more like a normal process of adding commits to an existing repository). I will prepare a PR with different but more obvious instructions.