Can Analog Pins be used as Digital Pins?

I am working on a project that needs more than the 8 Digital Pins included in the Particle Photon and I would like to know if it is possible to use the Analog Pins as Conventional Digital Pins

Yes, you can use all of the analog pins as digital pins.

so lets say i want to digital Read the Value of an Analog pin, I just call the function and place A0 instead of 1,2,3

Exactly.

Actually, it would be better not to ever use 1, 2, or 3; it will work, but it's better to be explicit, and use D1, D2, or D3.