Update README.md

Add description of new and original code.

README.md

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 # mac2bdf
 Convert Mac Font Resource to BDF
+
+## mac2bdf re-released
+Re-release of (abridged and modified) `mac2bdf` core functions under new copyrights and BSD 2-Clause license.
+
+  - https://github.com/skynavga/mac2bdf/blob/main/mac2bdf.c
+
+## mac2bdf original
+Original `mac2bdf` program under original copyright and Metis license as authored by Glenn Adams ([@skynavga](https://github.com/skynavga)). Note that the text of the Metis License is no longer available.
+
+  - https://github.com/skynavga/mac2bdf/blob/main/metis/mac2bdf.c