Tell me 100% free elibrary where i can read and/or download ebook etc on any topic.?

No such thing. There are libraries where you can get some ebooks, but there is no such library that has ebooks on any topic. Instead, go to your public library. There you can check out books on almost any topic you want. But right now there is no such on-line library as you are asking for.

You really need to learn how to use search engines.

http://www.thefreelibrary.com/