for linux and mac os x (and windows?)
Download the sonic source code
Unarchive the source.
mkdir sonic && tar xzvf sonic.tar.gz -C sonic && cd sonic
Run the install script - specify the directory you want to install to as well as the application namespace
./install /path/to/sonicdemo SonicDemo
You can pass in the argument --core-only if you would like to create a very lightweight application that includes just the core MVC framework and nothing else.
Follow the instructions in README to setup your vhosts in apache and setup your /etc/hosts file
Hit your site in a browser
This is the fastest possible way to get set up.
If you would prefer a more manual approach download the source code and follow the instructions in the provided README file.