readme update

readme.md

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 # Code for TMP117 + Pico W Temperature Measurement System
 
-A "global_config.json" file is required for the code to run. Here, all the settings are defined. An example is given in "example_global_config.json".
+This code is indended to run on a Pico W running Micropython.
+
+## To run on a Pico W:
+ - Download this repository and copy these files onto the Micropython filesystem via USB (this can be accomplished using Thonny, the VSCode extension "MicroPico" etc).
+ - Write a "global_config.json" file (see the example for a template), which defines various settings, I2C buses, and connected sensors.
+ - Once the microcontroller is reset, the main.py file will execute and the code will run.
+
+
+To work on this code, you will need a Micropython editor. I recommend VSCode + MicroPico extension written by paulober (GitHub).