I'm sharing a schematic here that I'm going to use for designing a PCB, its a minimal setup with a program port, SPI and UART output
Please note that
1. I did not put RESET button that will be controlled through USB programmer
2. I2C pins are pulled up but they are not connected to main connector
3. I did not need to add any voltage regulator
R2 = 470
R5 is not set yet
remain all Resistors are 10k
C1 = 100nf
C2 = 10uf
Datasheet and picture are attached.