Add HangOps.ru Skype chat

I've added the entry in README.md, but I can't create a link to the
conference itself using bit.ly. Here's the public room URI:
skype:?chat&blob=YfEj18-7MFx7pzaZgmxEXJxutmSNQarKDf2YBmYvNsIj1MLp9wroNHIUjBRHzbWBsHeLM4Milg7woizMZ9wZnLb8Mdo2vHM8DlKTdBkhhc-ze5lhz3QcPtlJ1QO9dQo2BE1XvytR

There are no specific join rules.