[CMake] HowTo: write install_package function

[Cedric Doucet]

Hello, 

I would like to write a function called install_package which works like the find_package function, but for installation of external packages (thanks to ExternalProject). 
Thus, I would like to write modules InstallFoo.cmake so as to be able to call my function like this: 
install_package(Foo) # installation of Foo library 

Do you know if it is possible to implement such a thing? 
Is there another function I could study to understand how to do it? 
I tried to look at the implementation of the find_package function in my CMake's installation but I did not manage to find it. 

Cédric 
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