Added a Videur api-spec file

> Ah, are we bikeshedding on the comments?

it looks like you are :)

> I though it was about the protocol.

I am very confused. You said to replace the /* xxx */ comment by // xxx 

```
nit: use a simple "//" comment.
```
this file was taken from msisdn.  What do you mean by protocol ?

> It's a nitpick. Feel free to adress or not.

My question is: should we use // in both projects ?