Add Linux Inside of @0xAX

Linux Inside is a series of posts about the linux kernel and its insides.

free-programming-books.md

@@ -1379,6 +1379,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 * [Linux Device Drivers, 2nd Edition](http://www.xml.com/ldd/chapter/book/index.html)
 * [Linux Device Drivers, Third Edition](http://lwn.net/Kernel/LDD3/) - Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman
 * [Linux from Scratch](http://www.linuxfromscratch.org/lfs/view/stable/)
+* [Linux Inside](https://www.gitbook.com/book/0xax/linux-insides/details)
 * [Linux Kernel in a Nutshell](http://www.kroah.com/lkn/)
 * [Linux Newbie Administrator Guide](http://lnag.sourceforge.net)
 * [Linux Security for Beginners](http://www.linuxtopia.org/LinuxSecurity/index.html)