To get started with silicon you need the compiler Clang++ on your system (g++ fails at compiling silicon and I do not have access to other compilers).
The following will install Silicon and the Iod library.
git clone https://github.com/matt-42/silicon.git cd silicon; ./install.sh __YOUR__INSTALL__PREFIX__
Since Silicon in only an abstraction and does not implement a HTTP server, you will need to install libmicrohttpd if it is not already on your system.
You can now have a look at the hello world example and discover how to build and start a simple web server with silicon.