Add simple commands instead of Arducam_demo

[uacnix]

Hi, I've been playing around with the OV5642 mini module and RPI, and so far thats the only one project thats working correctly (plain arducam libs don't compile cause of smbus error), but its pretty useless, unless you get the .APK to connect, which is quite pointless if you want to operate the camera without android phone. Please attach at least one file that allows simple capture from CLI or script, instead of requiring an app for it.

[emmanuel-nwogu]

Hey, did you ever figure out how to get the OV5642 working with an RPI? I'm using a pi 4B by the way.