a2o/dev/pd/readme.md

# branch=pd

* for source experiments (parameters, etc. to change core gen), and other source updates for PD

### minimize cache/queues/etc. for eFabless

* the parameters were likely not tested much, and may have dependencies, etc.; see which ones can change and still compile/run simple test


### test OpenROAD tools

1. attempt unit synthesis and static timing, using blackbox arrays amd estimated wiring for some pdk