Simple example fails with No module named 'llama_cpp'

[jaraco]

After installing the dependencies (adjusted per #5 and #8), and attempting to run an example such as the one from the readme, it fails on the first line when llama_cpp isn't installed.

[jaraco]

I do see that after addressing #10 by installing jupyter, I'm able to launch the jupyter notebook, and it provides instructions on how to install llama_cpp. Those should probably be moved to the readme instead, since the examples rely on it outside of the jupyter example.