update readme install

ReadMe.md

@@ -7,4 +7,19 @@ There are 2 options, via the USB to CAN adapter (from seeed studio) or via the c
 
 Because we don't need it anymore, i will not further document this, but i published it because may someone want to use it to control the TEC directly
 
-in the tec.py file are also some TEST Routines for testing the TEC and controlling it, also with logs
+in the tec.py file are also some TEST Routines for testing the TEC and controlling it, also with logs
+
+
+## Install the CAN interface (for RPi CAN Hat)
+
+Add the following line to your /boot/config.txt file:
+`dtoverlay=mcp2515-can0,oscillator=12000000,interrupt=25,spimaxfrequency=2000000`
+
+`sudo reboot`
+
+`pip3 install python-can`
+... for python module
+
+maybe edit permissions
+`./resetCAN.sh`
+... for starting can0