Simple documentation on how to use autogenerated code that uses BlockFactory with CMake (#80)

Author: traversaro

doc/mkdocs/data/autogenerate_code.md

@@ -1,9 +1,17 @@
 # How to autogenerate C++ code
 
-!!! warning
-    This tutorial is not yet ready
+The capability of autogenerating C++ code from a Simulink model is provided by Simulink Coder. BlockFactory received a preliminary support of this toolbox, and only basic features are currently supported.
+If you are already building your Simulink autogenerated code via CMake, to start using code autogenerated from models that use BlockFactory's blocks, you simply need to look for `BlockFactory` in CMake as any other dependency via:
+~~~cmake
+find_package(BlockFactory COMPONENTS SimulinkCoder REQUIRED)
+~~~
 
-The capability of autogenerating C++ code from a Simulink model is provided by Simulink Coder. BlockFactory received a preliminary support of this toolbox, and only basic features are currently supported. Following the previous how-to, check these links for a simple example:
+and then link your target that contains the autogenerated code to the `BlockFactory::SimulinkCoder` imported target:
+~~~cmake
+target_link_libraries(<targetwithautogeneratecode> PRIVATE BlockFactory::SimulinkCoder)
+~~~
+
+For more advanced uses, check the following example:
 
 - [`AutogenerationExample.mdl`](https://github.com/robotology/blockfactory/tree/master/example/matlab/AutogenerationExample.mdl) A Simulink model with the right configuration of Simulink Coder
 - [`example/matlab/AutogenerationExample_grt_rtw`](https://github.com/robotology/blockfactory/tree/master/example/matlab/AutogenerationExample_grt_rtw) The folder containing the autogenerated sources