Create rfid_door_v1.ino

Version 0.1 of the code.
Planned additions:
-Random passcode generated
-Better storing of sd cards
-Better identification of sd cards
-Secure web-interface
-Log file
-Time frames
-Usage amount of a card
-One card to rule them all
Update rfid_door_v1.ino
Update README.md
Update README.md
Update README.md
Merge pull request #1 from cborsky/master

inital commit