Added link to learning guide page

Author: cogliano

PyPortal_EZ_Make_Oven/README.md

@@ -5,7 +5,7 @@ the controller. It also uses the Adafruit MCP9600 thermocouple amplifier, a ther
 
 A standard, non-digital toaster oven is needed for this project, which can be purchased online or at your nearest appliance store. It should be small (4 slice capacity), at least 1100 watts and a maximum temperature of 450F / 230C or better.
 
-Follow the Adafruit learn guide here: **coming soon**
+Follow the Adafruit learn guide here: https://learn.adafruit.com/ez-make-oven
 
 Run **codecalibrate.py** first to determine calibration settings for your toaster oven. You will need to re-run this if you switch toaster ovens or update the EZ Make Oven software. The calibration values displayed will need to be manually entered into the **config.json file**. This file also contains the I2C address of your MCP9600 breakout (in decimal) and the name of the solder profile to use. Available solder profiles can be found in the profiles folder. You will need to rename this file to **code.py** in order to run it.