do i need to also connect GND and 3.3v I am trying to run this code:
https://github.com/miguelbalboa/rfid/blob/master/examples/ReadNUID/ReadNUID.ino

Using an ESP8266 based D1 board and an RFID-RC522.

I am not able to get it to detect the rfid tags ...
the serial monitor just shows:

 ets Jan  8 2013,rst cause:4, boot mode:(3,4)

wdt reset
load 0x4010f000, len 1384, room 16 
tail 8
chksum 0x2d
csum 0x2d
v00000000
~ld


The "Typical pin layout used" section of the above document does not mention any connections on the 3.3V &amp; GND pins of the RFID-RC522 card.  

Does this mean that I do not need to connect them?
Or is is just so obvious that I should connect them that they did not bother to write it in that section?
It is just so obvious that you should connect them that they did not bother to write it down.

The reader needs power. That is taken as read. Without power it can do nothing. Why would they bother to waste time telling you to connect the things that you have to connect regardless? The only things that they tell you to connect are things that are specific to the sketch - i.e., which IO pins to connect to which function on the reader. Power doesn't change - it's the same from sketch to sketch and from person to person. The IO pins do, though, and need to be detailed. Power and ground don't.