Add 3D printed models to use regular raspberry pi camera

[koalazak]

Hello! this project is awasome!

I just found a c-mount CCTV lens on my local store so I made this 3D models to print the camera/spectrometer support and lens thread to use a regular (oficial) v2 raspberry pi camera.

Also I made some modifications in the README.md to acomodate some things and structure it better. I hope you don't mind. Also added an example testing a bandpass filter in front of the spectrometer.

thank you!