Added LinqToTwitter because tweetSharp is dead

I was running into some problems while using tweetSharp and after
further investing I found that tweetSharp was an open-source project but
the original author announced that he would no longer work on it. I
thought the existing implementation would work but soon determined that
it wouldn't after I found online that other people were having problems
with tweetSharp and had recommended some other options. I'm now trying
Linq to Twitter