open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/84|#84 Verilog file for IO cells>
Pull request opened by <https://github.com/dnltz|dnltz>
This pull requests adds klayoutrc to the .gitignore file and also adds a verilog file to describe the current sg13g2_io cells.
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>
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<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/84|#84 Verilog file for IO cells>
Pull request merged by <https://github.com/KrzysztofHerman|KrzysztofHerman>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>