Update README.md

Timers/README.md

@@ -5,3 +5,4 @@ This chapter describes timers and time management related concepts in the linux
 * [Introduction](http://0xax.gitbooks.io/linux-insides/content/Timers/timers-1.html) - this part is introduction to the timers in the Linux kernel.
 * [Introduction to the clocksource framework](https://github.com/0xAX/linux-insides/blob/master/Timers/timers-2.md) - this part describes `clocksource` framework in the Linux kernel.
 * [The tick broadcast framework and dyntick](https://github.com/0xAX/linux-insides/blob/master/Timers/timers-3.md) - this part describes tick broadcast framework and dyntick concept.
+* [Introduction to timers](https://github.com/0xAX/linux-insides/blob/master/Timers/timers-3.md) - this chapter describes timers in the Linux kernel.