Couple of Links added

I just added a couple of links under the Tutorial section on the left side of the page. The basic script examples page has several scripts that were written with the intention of teaching some basics about scripting in Second Life. The double tap detection script is an example of how a script can detect a double tap on the keyboard (useful for dash/dodge type things). I'm sure there are ways in which it can be more efficient or accurate, so it might get updated from time to time.