You can find in the folder **./examples**. This will help you get in touch with the software and test different configurations to see how FPGA-SPICE reacts to them.
Example 1 shows a very basic design with only 4 inputs on the LUTs, a FF and a MUX in the CLB (only 1). It implements an inverter and allows the user to see the very core of the .xml file.
Example 2 increases the complexity by having 3x3 CLBs and 4 slices per CLB. The slices provide a feedback to the input structure and input MUXs are added.