so, in the orange crab you have a Connector called ("io", 0)
if you want to, say, output something on the first pin of the connector, you have to first add a resource that uses this pin:
e.g. `platform.add_resources([(Resource("foo", 0, Pins("0", dir="o", conn=("io", 0))])`
then you can do `foo = platform.request("foo", 0)` in your design