Create WANTED.md

Author: jgarzik

WANTED.md

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+Developers looking for a starting point for contributions to posixutils-rs may consider these categories of changes:
+* Fill in missing utilities listed in [README](README.md)
+* Upgrade an existing utility from stage N to stage N+1
+* Optimize an existing utility to use less memory, or increase performance
+* Reduce dependencies.  Attempt to remove all usage of "heavy" deps such as rustix, nix or serde.
+* Improve build speed
+* Improve test speed
+* Find features that are not being tested, and add integration tests
+* Translate one or more utilities to a new language