Cairo book community guide (#1503)

Author: LandauRaz

components/Starknet/modules/quick-start/nav.adoc

@@ -26,4 +26,5 @@
         *** xref:starkgate:function-reference.adoc[Functions and events reference]
     ** Commuinty guides
         *** https://starknet-by-example.voyager.online/[Starknet By Example ↗^]
-        *** https://speedrunstark.com/[SpeedRun Stark ↗^]
+        *** https://speedrunstark.com/[SpeedRun Stark ↗^]
+        *** https://book.cairo-lang.org/ch100-00-introduction-to-smart-contracts.html[The Cairo book ↗^]