Hello,
I have 3+ years of experience in embedded domain. I have done many projects using raspberry pi, arduino, esp8266, arm, avr, linux, GSm,GPRS, ZigBee, Bluetooth, RFID, WIFi etc.
I go through your project. I made blue-print for this project.
First of all, I will unable USB/Ethernet on raspberry pi. Then make a web server on raspberry pi. Then I will interface RC522 - RFID Reader to the raspberry pi using SPI protocol. To read data from RC522 - RFID Reader, I will install python module MFRC522. When data will collected, it will sent using web server to web page running on PC.