Crystal Layout for RTC
According to the datasheet the PCF8523 has integrated oscillator load capacitors, so all you need to do is add the crystal close to the OSC pins and select the capacitance you need (7 pF or 12.5 pF). It is defined by the 4th bit of the CONTROL_1 register (00h).
Datasheet
Edit: In general your crystal layout looks fine. The main thing to keep in mind is that the traces need to be kept as short as possible and the capacitors need to be of appropriate value for the trace length.