added link

docs/index.rst

@@ -5,8 +5,8 @@ Jacdac Python API Reference
 for **microcontrollers** and their peripherals (sensors/actuators),
 with applications to rapid prototyping, making, and physical computing.
 
-Contents
---------
+Read the [user guide](https://microsoft.github.io/jacdac-docs/clients/python/) for projects
+and examples.
 
 .. toctree::
    :maxdepth: 4