Add contribution policy

Author: caprica

CONTRIBUTING.md

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+# CONTRIBUTING
+
+## Pull Requests
+
+All pull requests, other then GitHub official Dependabot requests, apparently
+submitted by or written by or with the assistance of AI, will be rejected with
+prejudice and the offending account permanently blocked - no exceptions, no
+appeals, no second chances, no reversals.
+
+In all other cases, if you submit a pull request you are agreeing to transfer
+any and all of your own copyright rights in that pull request to Caprica Software
+Limited for no consideration whatsoever in return so that our ability to continue
+our commercial software licensing business is not impeded in any way.
+
+If you don't like this policy, that's fine, don't submit any contributions.