Updated README.md

Author: Helias

README.md

@@ -4,5 +4,8 @@
 ## [Download SMART](https://github.com/smart-tool/smart/releases)
 The release of smart will be available [here](https://github.com/smart-tool/smart/releases)
 
+## How to use?
+The documentation about smart is available [here](http://www.dmi.unict.it/~faro/smart/howto.php)
+
 ## How to compile it from source
 To compile the source just download (or clone) this repository and run the file makefile from terminal (with **./makefile**), it will compile the smart binaries and all the algorithms (the algorithms binaries will be created into source/bin/).