readme: add mention to PDC files

hdl / constraints

Constraint files for Hardware Description Language (HDL) designs targeting FPGA boards

https://hdl.github.io/constraints

Apache License 2.0

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Closed rodrigomelo9 closed 3 years ago

rodrigomelo9 commented 3 years ago

Add PDC files to cover the four main vendors. Also solved a typo.

What about to change Altera Quartus-II to Intel Quartus Prime? (to be updated :-D)

umarcor commented 3 years ago

Thanks!