sky130_fd_io: Initial documentation only release.
The SKY130 IO cells is a toolkit IP. It contains all the cells and
primitives required to construct an I/O ring in the SKY130 technology.
This sky130_fd_io library contained in this document covers different
kinds of I/O cells,
* a general purpose I/O (`sky130_fd_io__gpio`), and
* a special I/O (`sky130_fd_io__sio`),
* a reference generator (`sky130_fd_io__refgen`) for providing voltage
references to the `sky130_fd_io__sio`, and
* Power and Ground (PG) cells that make up the I/O ring.
Signed-off-by: Tim 'mithro' Ansell <email@example.com>
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