add Geometry parameters field to DNADesign #84
Description
It should have the same fields and interpretation as Parameters in codenano:
https://docs.rs/codenano/0.5.1/codenano/struct.Parameters.html
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It should have the same fields and interpretation as Parameters in codenano:
https://docs.rs/codenano/0.5.1/codenano/struct.Parameters.html