Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Any and all contributions are welcome.
+
+Here are some things that need work:
+
+- Port all of Fish's functionality
+  - Specifically, Fish's Darwin and Degroff parsers
+  - Figure out why fish only seems to use man1, man6, and man8
+- Tests:
+  - Add .gz and .bz2 files to the tests folder?
+  - Test excluding/including commands and directories
+  - Find samples of type 4 man pages, Darwin, and Degroff to test
+- Handle options like `-vv` and `-/` in Nushell
+- Infer types of parameters (e.g. from `-d=DIR`)
+  - Probably very tough but nice to have in future sometime