Promoting TutorialsPoint's D tutorial

[Ecstatic Coder via Digitalmars-d]

And btw, I actually consider this tutorial more like the fifth D 
book.

Because once you download the PDF, honestly it's quite close to a 
real printed book.

Hence my suggestion to put it AT LEAST under the four official 
books.

I know it's not perfect. It could be simpler at some places, and 
more complete here and there.

But it's quite good, easy to download, and maybe the best D book 
0 dollars can buy you (unless you are kind enough and can afford 
to pay for it).