Add the Crapper UML policy and diagram.

Generated from the Python package under src/crapper.
EOF && git status -sb && git log -3 --oneline

examples/crapper.policy.edn

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+{:title "Crapper"
+ :prefix "crapper"
+ :lang :python
+ :src "src"
+ :out "examples/crapper.edn"
+ :hierarchical true
+ :foreign [dataclasses functools json os pathlib re shlex shutil subprocess sys
+           tree_sitter_language_pack urllib xml]
+ :order [model discover crapper
+         crap coverage metrics report languages
+         analyze runners
+         cli
+         __main__]
+ :levels [[model discover crapper]
+          [crap coverage metrics report languages]
+          [analyze runners]
+          [cli]
+          [__main__]]}