Mention Free Ebook Foundation

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 The book can be freely accessed via https://sysprog21.github.io/lkmpg/ or [latest PDF file](https://github.com/sysprog21/lkmpg/releases).
 The original guide may be found at [Linux Documentation Project](http://www.tldp.org/LDP/lkmpg/).
+You may check other [freely available programming books](https://ebookfoundation.github.io/free-programming-books/books/free-programming-books.html) listed by The [Free Ebook Foundation](https://ebookfoundation.org/).
 
 ## Getting Started